Polymer stabilizer and polymer compositions stabilized therewith
AssigneeArgus Chemical Corporation
InventorsKook-Jin Bae, Stuart D. Brilliant, Michael R. Croce
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Abstract
Blends of methyltin mercapto carboxylic acid esters and butyltin carboxylates which form homogeneous stable liquid mixtures and provide initial color control, processing heat stability, as well as light stability to chlorinated polymers are disclosed. As these compositions are homogeneous liquids at ambient temperatures they can be readily measured and mixed into the resins, and are thus easy to formulate, market and use.
Claims19
A homogeneous liquid stabilizer for vinyl halide resin compositions that comprises
- (a) an organotin mercaptocarboxylic acid ester having the structural formula
- R.sub.m SnX.sub.(4-m)
- wherein R is methyl and X represents an ester of a mercapto carboxylic acid having 2 carbon atoms with an alcohol having 4 to 14 carbon atoms whose sulfur atom is linked to the tin atom and m is 1 or 2;
- and
- (b) a butyltin carboxylate having the structural formula
- R'.sub.n SnY.sub.(4-n)
- wherein, R' is butyl, Y represents --O--CO--R" wherein R" is selected from the group consisting of alkyl groups having from 8 to 13 carbon atoms, and n is 2.
A method for making a weatherable vinyl halide resin comprising mixing a vinyl chloride homopolymer, a methacrylate- butadiene-styrene impact modifier, at least one processing aid selected from the group consisting of acrylic processing aids, calcium stearate and paraffin wax, a pigment and a homogeneous liquid stabilizer composition, said stabilizer composition including from 0.5 to 3% by weight of said homopolymer, of a blend of monomethyltin tris isooctylthioglycolate, dimethyltin bis isooctylthioglycolate, dibutyl tin dilaurate and 1,1,3-tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane.
Dependencies are inferred from the claim text.