Process of molding products by rim
AssigneeBayer Aktiengesellschaft
InventorsBernhard Jansen, Jurgen Gronen, Hanns P. Muller
Life of this patent
Estimating the term…
Abstract
The present invention relates to the use of organic compounds which contain epoxide groups and which are subjected to a heat treatment at 30.degree. to 150.degree. C. in the presence of an alkylating agent, as auxiliary substances to increase the weather resistance of molded plastic parts. These molded parts are produced by the reaction injection molding technique and the process comprises reacting reaction mixtures based on polyioscyanate addition products.
Claims5
In a process for the production of molded plastic parts by a reaction injection molding technique comprising reacting a reaction mixture of
- a) a polyisocyanate and
- b) a polyfunctional isocyanate-reactive component comprising
- i) polyether polyols or aminopolyethers having molecular weights of from 1800 to 12,000,
- ii) low molecular weight compounds selected from the group consisting of polyhydric alcohols, polyamines, and mixtures thereof, and
- iii) auxiliary substances and additives, in a mold, allowing the mixture to react, and removing the part from the mold, the improvement wherein said reaction mixture contains a substance comprising one or more organic compounds which contain epoxide groups and which are subjected to heat treatment at 30.degree. to 150.degree. C. in the presence of an alkylating agent.
Dependencies are inferred from the claim text.