US 5,183,852 AGranted

Polyblends containing polyurethane, polymer and siloxane crosslinker

AssigneeMonsanto Company

InventorPeter M. Gomez

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Abstract

The invention pertains to blends of polymers containing a polyurethane, a polymer having reactive carboxyl moieties and a siloxane crosslinking agent. The polymer is most preferably represented by a terpolymer. The crosslinking agent contains reactive moieties such as hydroxy-, amine-, and epoxy-moieties and has a molecular weight which is preferably in the range of from about 1,500 to 60,000. The crosslinker can be used in relatively low molecular ratios vs. the polymerisable dicarboxylic acid in the polymer. Shaped articles made from the polyblends herein can be processed under high temperature conditions without suffering alterations; the articles so produced show desirable physical properties inclusive of reduced plasticiser migration, reduced fogging and enhanced low-temperature flexibility.

Claims9

Dependent claims

A polyblend comprising

(a) from 20% to 89% by weight of a polyurethane;
(b) from 10% to 70% by weight of a polymer comprising:
1. from 10% to 95% of a vinylaromatic monomer;
2. from 5% to 50% of a polymerisable unsaturated dicarboxylic acid;
and
3. from 0% to 50% of a polymerisable ester of an unsaturated carboxylic acid;
(c) from 1% to 25% by weight of a siloxane crosslinker having the formula ##STR6## wherein, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 independently represent a straight, branched, or substituted alkyl group having from 1 to 8 carbon atoms or a carbocyclic group, having 5 to 6 carbon atoms, m is an integer such that the molecular weight of the resulting siloxane is from 1,500 to 60,000 and X and Y individually represents a terminal group carrying a reactive moiety independently selected from the group consisting of amine, hydroxy or epoxy moieties.
(d) from 0% to 50% by weight of a further polymeric ingredient;
wherein the amounts of components (a), (b), (c) and (d) total 100%.

6 more elements

Dependencies are inferred from the claim text.