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US 5,686,025 AGranted
Stabilizer and blowing agent useful for rigid foamed PVC
AssigneeWitco Corporation
InventorCurtis R. Martin
Life of this patent
Estimating the term…
Abstract
Improved activation of the blowing agent used to form blown PVC products, as well as thermal stabilization, are provided by a combination of an ester of the formula (R.sup.1).sub.1-2 Sn(--S--R.sup.a --OC(.dbd.O)R.sup.2).sub.2-3 wherein R.sup.1 is C.sub.1-4 alkyl, R.sup.a is alkyl, and R.sup.2 is C.sub.6-24 alkyl or alkenyl; one or both of mono (C.sub.1-4 alkyl) and di(C.sub.1-4 alkyl) tin sulfides; a complex of diorganotin oxide with an oxygen-containing acid; and optionally an ester HS--R.sup.c --OC(.dbd.O)R.sup.3 wherein R.sup.c is alkyl and R.sup.3 is C.sub.6-24 alkyl or alkenyl.
Claims32
An activator system comprising
- (a) one or more compounds of formula (A)
- (R.sup.1).sub.a Sn(--S--R.sup.a --OC(.dbd.O)R.sup.2).sub.4-a (A)
- wherein R.sup.1 independently at each occurrence is straight or branched alkyl containing 1 to 12 carbon atoms;
- R.sup.a is a divalent alkyl radical containing 2 to 20 carbon atoms;
- a is 1 to 2;
- R.sup.2 independently at each occurrence is straight or branched alkyl or alkenyl containing 6 to 24 carbon atoms and 0 to 4 carbon-carbon double bonds;
- admixed with one or more compounds selected from the group consisting of monoalkyl tin sulfides and dialkyltin sulfides, in which group each alkyl substituent is independently straight or branched alkyl containing 1 to 12 carbon atoms;
- and
- (b) a diorganotin complex with an ester of an oxygen-containing acid, wherein the two organo groups are each attached to tin through carbon atoms and are hydrocarbon radicals having from one to about thirty carbon atoms, and said complex is derived from the reaction of a diorganotin oxide with an ester derived from an aliphatic or aromatic alcohol or phenol and an acid selected from the group consisting of hydrocarbyl carboxylic acids, sulfur-containing hydrocarbyl carboxylic acids, hydroxy-containing hydrocarbyl carboxylic acids, phosphoric acid, sulfuric acid, sulphurous acid, nitric acid, nitrous acid, boric acid, arsenic acid and silicic acid.
6 more elements
An activator system comprising
- (a') one or more compounds of formula (A*)
- (R.sup.1).sub.a Sn(--S-Z-(COOR.sup.m).sub.m).sub.4-a (A*)
- where R.sup.1 independently at each occurrence is straight or branched alkyl containing 1 to 12 carbon atoms, a is 1 to 2, Z is an organic radical containing 1 to 30 carbon atoms, each R.sup.m is independently an organic radical derived from an alcohol containing 1 to 4 hydroxyl groups and containing 1 to 30 carbon atoms, and m is 1 to 4;
- admixed with one or more compounds selected from the group consisting of monoalkyl tin sulfides and dialkyl tin sulfides, in which group each alkyl substituent independently is straight or branched alkyl containing 1 to 12 carbon atoms;
- (b) a diorganotin complex with an ester of an oxygen-containing acid, wherein the two organo groups are each attached to tin through carbon atoms and are hydrocarbon radicals having from one to about thirty carbon atoms, and said complex is derived from the reaction of a diorganotin oxide with an ester derived from an aliphatic or aromatic alcohol or phenol and an acid selected from the group consisting of hydrocarbyl carboxylic acids, hydroxy-containing hydrocarbyl carboxylic acids, phosphoric acid, sulfuric acid, arsenic acid and silicic acid;
- and
- one or more esters of the formula HS--R.sup.c --OC(.dbd.O)R.sup.3, wherein R.sup.c is a divalent alkyl radical containing 2 to 20 carbon atoms, and R.sup.3 is straight or branched alkyl or alkenyl containing 6 to 24 carbon atoms and 0 to 4 carbon-carbon double bonds.
4 more elements
An activator system comprising (a.sup.1) one or more compounds of formula (A*)
- (R.sup.1).sub.a Sn(--S-Z-(COOR.sup.m).sub.m).sub.4-a (A*)
- wherein R.sup.1 independently at each occurrence is straight or branched alkyl containing 1 to 12 carbon atoms, a is 1 to 2, Z is an organic radical containing 1 to 30 carbon atoms, each R.sup.m is independently an organic radical derived from an alcohol containing 1 to 4 hydroxyl groups and containing 1 to 30 carbon atoms, and m is 1 to 4;
- admixed with one or more monoalkyl tin sulfides and one or more dialkyl tin sulfides, in which each alkyl substituent independently is straight or branched alkyl containing 1 to 12 carbon atoms;
- wherein the molar ratio of monoalkyl tin compounds to dialkyl tin compounds is at least 0.2:1, based on all compounds of formula (A*) and all monoalkyl and dialkyl tin sulfides present;
- (b) a diorganotin complex with an ester of an oxygen-containing acid, wherein the two organo groups are each attached to tin through carbon atoms and are hydrocarbon radicals having from one to about thirty carbon atoms, and said complex is derived from the reaction of a diorganotin oxide with an ester derived from an aliphatic or aromatic alcohol or phenol and an acid selected from the group consisting of hydrocarbyl carboxylic acids, hydroxy-containing hydrocarbyl carboxylic acids, phosphoric acid, sulfuric acid, arsenic acid and silicic acid.
2 more elements
Dependencies are inferred from the claim text.