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US 4,298,701 AGranted
Process for the production of elastic shaped articles
AssigneeBayer Aktiengesellschaft
InventorsHolger Meyborg, Christian Weber
Life of this patent
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Abstract
This invention relates to an improved single-stage process for the production of elastic shaped articles having an impervious surface layer by the reaction injection molding technique in which highly reactive systems of polyisocyanates, relatively high molecular weight polyhydroxyl compounds and aromatic polyamines are used.
Claims8
A process for the production of elastic, shaped articles which comprises reacting a reaction mixture comprising:
- (a) organic polyisocyanates;
- (b) polyhydroxy polyethers having a molecular weight of from 1,000 to 12,000;
- (c) aromatic diamines or polyamines as chain-extending agents;
- and
- (d) catalysts for the reaction between hydroxyl and isocyanate groups;
- said reaction mixture being processed as one-shot systems by the reaction injection molding technique and said reactants being used in quantities corresponding to an isocyanate index of from 70 to 130, characterized in that component (b) comprises polyhydroxy polyethers from 10 to 80% by weight of the polyether chains therein consisting of ethylene oxide units and at least 50% of the hydroxyl groups consisting of secondary hydroxyl groups.
3 more elements
Dependencies are inferred from the claim text.