Stabilizer mixtures
AssigneeBayer Aktiengesellschaft
InventorsErich Eimers, Rolf Dheim, Wolfgang Cohnen
Life of this patent
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Abstract
The present invention teaches mixtures of neutral esters of phosphorous acid with oxetane compounds and plastics stabilized by the incorporation of said mixtures. The present invention teaches a method of improving the retention of light transmission in plastics, particularly polycarbonate, by the incorporation therein of mixtures of neutral esters of phosphorous acid and oxetane compounds in which there are 2 to 10 oxetane groups per phosphorus atom.
Claims33
A mixture comprising an oxetanyl free neutral ester of phosphorous acid and an oxetane compound and containing from 2 to 10 oxetane groups per phosphorus atom and wherein the oxetane compound is a compound of the formula ##STR6## wherein each of the six groups R independently represents a hydrogen atom or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl group or a group of the formula CH.sub.2 O-R.sup.1 in which
- R.sup.1 represents a (C.sub.1 -C.sub.18)-alkyl, (C.sub.6 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)aralkyl, an acyl radical of a mono- or polybasic carboxylic acid, or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids.
A stabilizer mixture comprising an oxetanyl free neutral ester of phosphorous acid and an oxetane compound of the general formula (3) ##STR9## wherein R.sub.1 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.6 -C.sub.15 -aryl, (C.sub.6 -C.sub.15 -aryl)-oxymethyl, C.sub.7 -C.sub.15 -aralkyl or (C.sub.7 -C.sub.15 -aralkyl)-oxymethyl,
- R.sub.2 is C.sub.1 -C.sub.18 -alkyl, C.sub.6 -C.sub.15 -aryl, C.sub.7 -C.sub.15 -aralkyl or the acyl radical of a monobasic or polybasic carboxylic acid or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic and diarylphosphinic acids, and
- n is an integer which has a value of 1 or is equal to the acid functionality of the acid from which the acid radical R.sub.2 is derived, said mixture containing from 2 to 10 oxetane groups per phosphorus atom.
A plastics composition stabilized against discoloration from heat and atmospheric oxygen comprising a plastics material, and an effective amount of a mixture of an oxetanyl free neutral ester of phosphorous acid and a phosphorus free oxetane compound, the mixture containing from 2 to 10 oxetane groups per phosphorus atom.
A method of improving the stability of a plastics composition with respect to the light-transmission characteristics which comprises adding to the plastics material an effective amount of a mixture comprising an oxetanyl free neutral ester of phosphorous acid and a phosphorus free oxetane compound, said mixture containing from 2 to 10 oxetane groups per phosphorus atom.
A stabilized resin comprising a polybutadiene, and a stabilizing amount of a mixture of an oxetanyl free neutral ester of phosphorous acid and an oxetane compound having a formula selected from ##STR13## wherein each of the six groups R independently represents a hydrogen atom or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl group or a group of the formula CH.sub.2 O-R.sup.1 in which
- R.sup.1 represents a hydrogen atom, or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl, an acyl radical of a mono- or polybasic carboxylic acid, or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and ##STR14## wherein R.sub.1 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.1 -C.sub.18 -hydroxyalkyl, C.sub.6 -C.sub.15 -aryl, (C.sub.6 -C.sub.15 -aryl)-oxymethyl, C.sub.7 -C.sub.15 -aralkyl or (C.sub.7 -C.sub.15 -aralkyl)-oxymethyl,
- R.sub.2 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.6 -C.sub.15 -aryl, C.sub.7 -C.sub.15 -aralkyl or the acyl radical of a monobasic or polybasic carboxylic acid
- or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and
- n is an integer which has a value of 1 or is equal to the acid functionality of the acid from which the acid radical R.sub.2 is derived, said mixture containing from 2 to 10 oxetane groups per phosphorus atom.
A stabilized resin comprising high or low pressure polyethylene, and a stabilizing amount of a mixture of an oxetanyl free neutral ester of phosphorous acid and an oxetane compound having a formula selected from ##STR15## wherein each of the six groups R independently represents a hydrogen atom or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl group or a group of the formula CH.sub.2 O-R.sup.1 in which
- R.sup.1 represents a hydrogen atom, or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl, an acyl radical of a mono- or polybasic carboxylic acid, or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and ##STR16## wherein R.sub.1 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.1 -C.sub.18 -hydroxyalkyl, C.sub.6 -C.sub.15 -aryl, (C.sub.6 -C.sub.15 -aryl)-oxymethyl, C.sub.7 -C.sub.15 -aralkyl or (C.sub.7 -C.sub.15 -aralkyl)-oxymethyl,
- R.sub.2 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.6 -C.sub.15 -aryl, C.sub.7 -C.sub.15 -aralkyl or the acyl radical of a monobasic or polybasic carboxylic acid
- or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and
- n is an integer which has a value of 1 or is equal to the acid functionality of the acid from which the acid radical R.sub.2 is derived, said mixture containing from 2 to 10 oxetane groups per phosphorus atom.
A stabilized resin comprising polypropylene, and a stabilizing amount of a mixture of an oxetanyl free neutral ester of phosphorous acid and an oxetane compound having a formula selected from ##STR17## wherein each of the six groups R independently represents a hydrogen atom or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl group or a group of the formula CH.sub.2 O-R.sup.1 in which
- R.sup.1 represents a hydrogen atom, or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl, an acyl radical of a mono- or polybasic carboxylic acid, or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and ##STR18## wherein R.sub.1 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.1 -C.sub.18 -hydroxyalkyl, C.sub.6 -C.sub.15 -aryl, (C.sub.6 -C.sub.15 -aryl)-oxymethyl, C.sub.7 -C.sub.15 -aralkyl or (C.sub.7 -C.sub.15 -aralkyl)-oxymethyl,
- R.sub.2 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.6 -C.sub.15 -aryl, C.sub.7 -C.sub.15 -aralkyl or the acyl radical of a monobasic or polybasic carboxylic acid
- or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and
- n is an integer which has a value of 1 or is equal to the acid functionality of the acid from which the acid radical R.sub.2 is derived, said mixture containing from 2 to 10 oxetane groups per phosphorus atom.
A stabilized resin comprising polyacrylonitrile, and a stabilizing amount of a mixture of an oxetanyl free neutral ester of phosphorous acid and an oxetane compound having a formula selected from ##STR19## wherein each of the six groups R independently represents a hydrogen atom or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl group or a group of the formula CH.sub.2 O-R.sup.1 in which
- R.sup.1 represents a hydrogen atom, or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl, an acyl radical of a mono- or polybasic carboxylic acid, or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and ##STR20## wherein R.sub.1 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.1 -C.sub.18 -hydroxyalkyl, C.sub.6 -C.sub.15 -aryl, (C.sub.6 -C.sub.15 -aryl)-oxymethyl, C.sub.7 -C.sub.15 -aralkyl or (C.sub.7 -C.sub.15 -aralkyl)-oxymethyl,
- R.sub.2 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.6 -C.sub.15 -aryl, C.sub.7 -C.sub.15 -aralkyl or the acyl radical of a monobasic or polybasic carboxylic acid
- or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and
- n is an integer which has a value of 1 or is equal to the acid functionality of the acid from which the acid radical R.sub.2 is derived, said mixture containing from 2 to 10 oxetane groups per phosphorus atom.
A stabilized resin comprising an acrylonitrile-butadiene-styrene copolymer, and a stabilizing amount of a mixture of an oxetanyl free neutral ester of phosphorous acid and an oxetane compound having a formula selected from ##STR21## wherein each of the six groups R independently represents a hydrogen atom or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl group or a group of the formula CH.sub.2 O-R.sup.1 in which
- R.sup.1 represents a hydrogen atom, or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl, an acyl radical of a mono- or polybasic carboxylic acid, or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and ##STR22## wherein R.sub.1 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.1 -C.sub.18 -hydroxyalkyl, C.sub.6 -C.sub.15 -aryl, (C.sub.6 -C.sub.15 -aryl)-oxymethyl, C.sub.7 -C.sub.15 -aralkyl or (C.sub.7 -C.sub.15 -aralkyl)-oxymethyl,
- R.sub.2 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.6 -C.sub.15 -aryl, C.sub.7 -C.sub.15 -aralkyl or the acyl radical of a monobasic or polybasic carboxylic acid
- or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and
- n is an integer which has a value of 1 or is equal to the acid functionality of the acid from which the acid radical R.sub.2 is derived, said mixture containing from 2 to 10 oxetane groups per phosphorus atom.
A stabilized resin comprising a polyvinyl chloride, and a stabilizing amount of a mixture of an oxetanyl free neutral ester of phosphorous acid and an oxetane compound having a formula selected from ##STR23## wherein each of the six groups R independently represents a hydrogen atom or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl group or a group of the formula CH.sub.2 O-R.sup.1 in which
- R.sup.1 represents a hydrogen atom, or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl, an acyl radical of a mono- or polybasic carboxylic acid, or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and ##STR24## wherein R.sub.1 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.1 -C.sub.18 -hydroxyalkyl, C.sub.6 -C.sub.15 -aryl, (C.sub.6 -C.sub.15 -aryl)-oxymethyl, C.sub.7 -C.sub.15 -aralkyl or (C.sub.7 -C.sub.15 -aralkyl)-oxymethyl,
- R.sub.2 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.6 -C.sub.15 -aryl, C.sub.7 -C.sub.15 -aralkyl or the acyl radical of a monobasic or polybasic carboxylic acid
- or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and
- n is an integer which has a value of 1 or is equal to the acid functionality of the acid from which the acid radical R.sub.2 is derived, said mixture containing from 2 to 10 oxetane groups per phosphorus atom.
A stabilized resin comprising an addition polymer, and a stabilizing amount of a mixture of an oxetanyl free neutral ester of phosphorous acid and an oxetane compound having a formula selected from ##STR25## wherein each of the six groups R independently represents a hydrogen atom or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl group or a group of the formula CH.sub.2 O-R.sup.1 in which
- R.sup.1 represents a hydrogen atom, or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl, an acyl radical of a mono- or polybasic carboxylic acid, or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and ##STR26## wherein R.sub.1 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.1 -C.sub.18 -hydroxyalkyl, C.sub.6 -C.sub.15 -aryl, (C.sub.6 -C.sub.15 -aryl)-oxymethyl, C.sub.7 -C.sub.15 -aralkyl or (C.sub.7 -C.sub.15 -aralkyl)-oxymethyl,
- R.sub.2 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.6 -C.sub.15 -aryl, C.sub.7 -C.sub.15 -aralkyl or the acyl radical of a monobasic or polybasic carboxylic acid
- or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and
- n is an integer which has a value of 1 or is equal to the acid functionality of the acid from which the acid radical R.sub.2 is derived, said mixture containing from 2 to 10 oxetane groups per phosphorus atom.
A stabilized resin comprising a polyphenylene oxide, and a stabilizing amount of a mixture of an oxetanyl free neutral ester of phosphorous acid and an oxetane compound having a formula selected from ##STR27## wherein each of the six groups R independently represents a hydrogen atom or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl group or a group of the formula CH.sub.2 O-R.sup.1 in which
- R.sup.1 represents a hydrogen atom, or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl, an acyl radical of a mono- or polybasic carboxylic acid, or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and ##STR28## wherein R.sub.1 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.1 -C.sub.18 -hydroxyalkyl, C.sub.6 -C.sub.15 -aryl, (C.sub.6 -C.sub.15 -aryl)-oxymethyl, C.sub.7 -C.sub.15 -aralkyl or (C.sub.7 -C.sub.15 -aralkyl)-oxymethyl,
- R.sub.2 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.6 -C.sub.15 -aryl, C.sub.7 -C.sub.15 -aralkyl or the acyl radical of a monobasic or polybasic carboxylic acid
- or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and
- n is an integer which has a value of 1 or is equal to the acid functionality of the acid from which the acid radical R.sub.2 is derived, said mixture containing from 2 to 10 oxetane groups per phosphorus atom.
A stabilized resin comprising a polyamide and a stabilizing amount of a mixture of an oxetanyl free neutral ester of phosphorous acid and an oxetane compound having a formula selected from ##STR29## wherein each of the six groups R independently represents a hydrogen atom or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl group or a group of the formula CH.sub.2 O-R.sup.1 in which
- R.sup.1 represents a hydrogen atom, or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl, an acyl radical of a mono- or polybasic carboxylic acid, or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and ##STR30## wherein R.sub.1 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.1 -C.sub.18 -hydroxyalkyl, C.sub.6 -C.sub.15 -aryl, (C.sub.6 -C.sub.15 -aryl)-oxymethyl, C.sub.7 -C.sub.15 -aralkyl or (C.sub.7 -C.sub.15 -aralkyl)-oxymethyl,
- R.sub.2 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.6 -C.sub.15 -aryl, C.sub.7 -C.sub.15 -aralkyl or the acyl radical of a monobasic or polybasic carboxylic acid
- or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and
- n is an integer which has a value of 1 or is equal to the acid functionality of the acid from which the acid radical R.sub.2 is derived, said mixture containing from 2 to 10 oxetane groups per phosphorus atom.
A stabilized resin comprising a condensation polymer, and a stabilizing amount of a mixture of an oxetanyl free neutral ester of phosphorous acid and an oxetane compound having a formula selected from ##STR31## wherein each of the six groups R independently represents a hydrogen atom or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl group or a group of the formula CH.sub.2 O-R.sup.1 in which
- R.sup.1 represents a hydrogen atom, or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl, an acyl radical of a mono- or polybasic carboxylic acid, or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and ##STR32## wherein R.sub.1 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.1 -C.sub.18 -hydroxyalkyl, C.sub.6 -C.sub.15 -aryl, (C.sub.6 -C.sub.15 -aryl)-oxymethyl, C.sub.7 -C.sub.15 -aralkyl or (C.sub.7 -C.sub.15 -aralkyl)-oxymethyl,
- R.sub.2 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.6 -C.sub.15 -aryl, C.sub.7 -C.sub.15 -aralkyl or the acyl radical of a monobasic or polybasic carboxylic acid
- or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic acids and of diarylphosphinic acids, and
- n is an integer which has a value of 1 or is equal to the acid functionality of the acid from which the acid radical R.sub.2 is derived, said mixture containing from 2 to 10 oxetane groups per phosphorus atom.
A plastics composition stabilized against discoloration from heat and atmospheric oxygen comprising a plastics material, and an effective amount of a mixture of an oxetanyl free neutral ester of phosphorous acid and an oxetane compound of the formula (3) ##STR33## wherein R.sub.1 is H, C.sub.1 -C.sub.18 -alkyl, C.sub.1 -C.sub.18 -hydroxyalkyl, C.sub.6 -C.sub.15 -aryl, (C.sub.6 -C.sub.15 -aryl)-oxymethyl, C.sub.7 -C.sub.15 -aralkyl or (C.sub.7 -C.sub.15 -aralkyl)-oxymethyl,
- R.sub.2 is the ester residue of an acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic and diarylphosphinic acid, and
- n is an integer which has a value equal to the acid functionality of the acid from which the acid radical R.sub.2 is derived, said mixture containing from 2 to 10 oxetane groups per phosphorus atom.
A plastics composition stabilized against discoloration from heat and atmospheric oxygen comprising a plastics material and an effective amount of a mixture of an oxetanyl free neutral ester of phosphorous acid and an oxetane compound of the formula ##STR34## wherein each of the six groups R independently represents a hydrogen atom or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)aryl, (C.sub.7 -C.sub.15)-aralkyl group or a group of the formula CH.sub.2 O-R.sup.1 in which
- R.sup.1 represents a hydrogen atom, or a (C.sub.1 -C.sub.18)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.6 -C.sub.15)-aryl, (C.sub.7 -C.sub.15)-aralkyl, or acyl radical of a mono- or polybasic carboxylic acid, or the ester residue of an inorganic acid selected from the group consisting of boric, silicic, alkylboric, arylboric, stannoic, stibonic, orthophosphoric, pyrophosphoric, polyphosphoric, alkanephosphonic, arylphosphonic, dialkylphosphinic and diarylphosphinic acids, said mixture containing from 2 to 10 oxetane groups per phosphorus atom.
Dependencies are inferred from the claim text.