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US 2003/0158311 A1Published application
Stabilized halogen-containing polymer composition
AssigneeRohm and Haas Company
InventorsPaul Brian Adams, Gene Kelly Norris
Life of this patent
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Abstract
Halogen-containing polymer compositions containing a heat stabilizer comprising a latent mercaptan, a zinc salt, and a free mercaptan as a separate entity are protected during processing by the degradation products of the latent (i.e., blocked) mercaptan. A free mercaptan is among those products. The separate free mercaptan (i.e., an alien free mercaptan) enhances the activity of the latent mercaptan in a synergistic manner.
Claims10
A polymer composition normally susceptible to heat-induced decomposition comprising:
- a halogen-containing polymer, a latent mercaptan having the structure:
- 29
- wherein a is 0 or 1, m and n are 0 or 1;
- y=1 to 4;
- when y=1, z is 1 to 4;
- and when y is more than 1, z is 1;
- R1 is an alkyl, alkylenyl, cycloalkyl, cycloalkylenyl, aryl, alkaryl, aralkyl, aralkylenyl, hydroxyalkyl, dihydroxyalkyl, hydroxy(polyalkoxy)alkyl, alkoxyalkyl, hydroxyalkoxyalkyl, alkoxy(hydroxyalkyl), alkoxy(acyloxyalkyl), alkoxy(polyalkoxy)alkyl, alkoxy(polyalkoxy)carbonylalkyl, carboxyalkyl, acyloxyalkyl, acyloxy(hydroxyalkyl), acyloxyalkoxyalkyl, acyloxy(polyalkoxy)alkyl, benzoyloxy(polyalkoxy)alkyl, alkylenebis-(acyloxyalkyl), alkoxycarbonylalkyl, alkoxycarbonylalkylenyl, hydroxyalkoxycarbonylalkyl, hydroxy(polyalkoxy)carbonylalkyl, mercaptoalkyl, mercaptoalkylenyl, mercaptoalkoxycarbonylalkyl, mercaptoalkoxycarbonylalkylenyl, alkoxycarbonyl(amido)alkyl, alkylcarbonyloxy(polyalkoxy)carbonylalkyl, tetrahydopyranyloxy(polyalkoxy)carbonylalkyl, tetrahydropyranyloxyalkyl, hydroxyaryl, mercaptoaryl or carboxyaryl radical having from 1 to 22 carbon atoms;
- R2,R3,R4,R5,R6, and R7 are independently hydrogen, a hydroxyl, mercapto, acyl, alkyl, alkylenyl, aryl, haloaryl, alkaryl, aralkyl, hydroxyalkyl, mercaptoalkyl, hydroxyaryl, alkoxyaryl, alkoxyhydroxyaryl, mercaptoaryl groups having from 1 to 22 carbon atoms;
- X is aryl, haloaryl, alkaryl, aralkaryl, hydroxyaryl, dihydroxyaryl, arylcycloalkyl, or a heteroatom, with the option that when a is 1 and m is 1, R6 and R7 form a heterocyclic moiety in conjunction with X as nitrogen, and with the further option that when a=1 and m=0, one of R1, R3, and R5 joins with R7 and X to form a heterocyclic moiety with X as a heteroatom selected from the group consisting of oxygen and sulfur;
- with the proviso that z is 1 or 2 when X is aralkaryl, R6 and R7 are hydroxyl, a is 1 and m is 1, and with the further proviso that when R6 hydroxyl or mercapto, z is 1;
- an alien free mercaptan;
- and
- a zinc salt.
10 more elements
A stabilizer composition comprising a latent mercaptan having the structure:
- 30
- wherein a is 0 or 1, m and n are 0 or 1;
- y=1 to 4;
- when y=1, z is 1 to 4;
- and when y is more than 1, z is 1;
- R1 is an alkyl, alkylenyl, cycloalkyl, cycloalkylenyl, aryl, alkaryl, aralkyl, aralkylenyl, hydroxyalkyl, dihydroxyalkyl, hydroxy(polyalkoxy)alkyl, alkoxyalkyl, hydroxyalkoxyalkyl, alkoxy(hydroxyalkyl), alkoxy(acyloxyalkyl), alkoxy(polyalkoxy)alkyl, alkoxy(polyalkoxy)carbonylalkyl, carboxyalkyl, acyloxyalkyl, acyloxy(hydroxyalkyl), acyloxyalkoxyalkyl, acyloxy(polyalkoxy)alkyl, benzoyloxy(polyalkoxy)alkyl, alkylenebis-(acyloxyalkyl), alkoxycarbonylalkyl, alkoxycarbonylalkylenyl, hydroxyalkoxycarbonylalkyl, hydroxy(polyalkoxy)carbonylalkyl, mercaptoalkyl, mercaptoalkylenyl, mercaptoalkoxycarbonylalkyl, mercaptoalkoxycarbonylalkylenyl, alkoxycarbonyl(amido)alkyl, alkylcarbonyloxy(polyalkoxy)carbonylalkyl, tetrahydopyranyloxy(polyalkoxy)carbonylalkyl, tetrahydropyranyloxyalkyl, hydroxyaryl, mercaptoaryl or carboxyaryl radical having from 1 to 22 carbon atoms;
- R2,R3,R4,R5,R6, and R7 are independently hydrogen, a hydroxyl, mercapto, acyl, alkyl, alkylenyl, aryl, haloaryl, alkaryl, aralkyl, hydroxyalkyl, mercaptoalkyl, hydroxyaryl, alkoxyaryl, alkoxyhydroxyaryl, mercaptoaryl groups having from 1 to 22 carbon atoms;
- X is aryl, haloaryl, alkaryl, hydroxyaryl, dihydroxyaryl, alkoxyaryl, arylcycloalkyl, or a heteroatom, with the option that when a is 1 and m is 1, R6 and R7 form a heterocyclic moiety in conjunction with X as nitrogen, and with the further option that when a=1 and m=0, one of R1, R3, and R5 joins with R7 and X to form a heterocyclic moiety with X as a heteroatom selected from the group consisting of oxygen and sulfur;
- with the proviso that z is 1 or 2 when X is aralkaryl, R6 and R7 are hydroxyl, a is 1 and m is 1, and with the further proviso that when R6 hydroxyl or mercapto, z is 1;
- an alien free mercaptan constituting from 10 to 50% by weight of the mixture of the latent mercaptan and alien free mercaptan;
- and
- a zinc salt, wherein the weight ratio of the latent mercaptan/alien free mercaptan mixture to the zinc salt is from 3 to 250.
9 more elements
Dependencies are inferred from the claim text.