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US 5,294,677 AGranted
Housewares
AssigneeNovacor Chemicals (International) S.A.
InventorsDeborah I. Hauser, Michael B. Colella, William G. Blasius, Jr.
Life of this patent
Estimating the term…
Abstract
Many cleaners, are extremely hard on many plastic products causing environmental stress cracking. Small household articles made from a polymer alloy of a clear brittle styrenic acrylate, a rubbery block styrene-diene copolymer, and a ductile styrene-diene polymer when exposed to such cleaners have significantly less environmental stress cracking.
Claims31
A small household article having good environmental stress crack resistance to cleaners said article comprising:
- from 80 to 100% of a polymer alloy consisting essentially of:
- (i) from 30 to 82 weight % of a brittle polymer comprising:
- (a) from 80 to 40 weight percent of one or more C.sub.8-12 vinyl aromatic monomers which are unsubstituted or substituted by a C.sub.1-4 alkyl radical;
- (b) from 20 to 60 weight percent of one or more C.sub.1-6 alkyl esters of C.sub.3-6 ethylenically unsaturated carboxylic acids;
- and
- (c) from 0 to 5 weight percent of one or more C.sub.3-6 ethylenically unsaturated carboxylic acids;
- (ii) from 3 to 50 weight % of a rubbery polymer comprising:
- (a) from 40 to 45 weight percent of one or more C.sub.8-12 vinyl aromatic monomers;
- and
- (b) from 60 to 55 weight percent of one or more C.sub.4-6 conjugated diolefins;
- and
- (iii) from 15 to 67 weight percent of a ductile polymer comprising:
- (a) from 70 to 80 weight percent of one or more C.sub.8-12 vinyl aromatic monomers;
- and
- (b) from 30 to 20 weight percent of one or more C.sub.4-6 conjugated diolefins.
12 more elements
Dependencies are inferred from the claim text.