Stabilization of halopolymers with ionomers
AssigneeAusimont, U.S.A., Inc.
InventorsChii-Shu Chen, L. Lawrence Chapoy
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Abstract
A composition comprising a halopolymer, such as an ethylene/chlorotrifluoroethylene copolymer, an effective stabilizing amount of an ionomer, and an effective stabilizing amount of a compound such as a phosphite of an organic polyhydric phenol; a thioester; a phosphite; or a hindered phenolic antioxidant. Preferred ionomers are metal salts of ethylene-acrylic acid copolymers, and metal salts of sulfonated polystyrenes. The stabilized halopolymers have improved resistance to thermal degradation and suffer less discoloration when subjected to high melt processing or extrusion molding temperatures.
Claims23
A composition comprising:
- an ethylene/chlorotrifluoroethylene copolymer;
- and
- an effective stabilizing amount of (a) an ionomer selected from the group consisting of:
- (i) a salt of an acrylic acid-containing polymer having the following structural formula:
- ##STR8## , wherein R.sub.1 is an alkyl group having from 2 to 4 carbon atoms, R.sub.2 is hydrogen or methyl, m is from about 10 to about 4,000, n is from about 5 to about 2,000 and M+ is a metal cation;
- and
- (ii) a sulfonated polystyrene having the following structural formula:
- ##STR9## wherein y is from about 2 to about 2,000, and z is from 1 to about 1,000;
- and M+ is a metal cation;
- and
- (b) an effective stabilizing amount of at least one compound selected from the group consisting of:
- (i) a transesterification reaction product obtained from an organic polyhydric phenol selected from the group consisting of 1,1,3-tri-(2-methyl-4-hydroxy-5-tert-butyl phenyl) butane, and a phenol of the formula:
- ##STR10## , wherein X is selected from the group consisting of oxygen, sulfur, alkylene, alicyclidene, arylidene, and mixed alkylene-arylidene and alkylene-alicyclidene groups, wherein the aliphatic or cycloaliphatic portion of the molecule may be a straight or a branched chain, having from 1 to about 18 carbon atoms, and wherein each R may be the same or difference, and each R is independently selected from the group consisting of hydrogen and alkyl, straight or branched chain, and having from 1 to about 18 carbon atoms;
- and wherein m and n are integers from 1 to 5, and o and p are integers from 0 to 4, with the proviso that the sums of M+o and n+p may not exceed 5, and an organic phosphite triester free from phenolic hydroxyl groups, having up to about 60 carbon atoms obtained by transesterification of the phenol and phosphite at an elevated temperature sufficient to form a homogeneous mixture;
- (ii) a thioester;
- (iii) a phosphite;
- (iv) dibutyl maleate;
- (v) n-phenylmaleimide;
- (vi) acenaphthylene;
- (vii) sodium formate;
- (viii) N,N-metaphenylene dimaleimide;
- (ix) 9,10-dihydroanthracene;
- (x) triallyl cyanurate;
- (xi) triallyl isocyanurate;
- and
- (xii) hindered phenolic antioxidants.
Dependencies are inferred from the claim text.