Two-step curable mixer-suitable materials

Details Two-step curable mixer-suitable materials Two-step curable mixer-suitable materials

2006-02-28

2006-02-28

Moore, Margaret G. (Department: 1712)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C525S477000, C525S478000, C525S479000, C528S015000, C528S031000, C528S032000, C524S095000, C524S306000, C524S425000, C524S430000, C524S431000, C524S432000, C524S436000, C524S437000, C524S448000, C524S450000, C524S451000, C524S588000

Reexamination Certificate

active

07005460

ABSTRACT:
The present invention relates to a multi-component system for making impressions which contains(a) at least one compound having at least two alkenyl groups;(b) at least one organohydrogenpolysiloxane;(c) at least one hydrosilylation catalyst;characterized by containing(d1) at least one polymeric compound having at least one alkynyl group and/or(d2) at least one compound having at least one Si—OR structural unit, wherein R=H, alkyl, alkoxyalkyl or acyl; andwhen a compound (d2) having at least one Si—OR structural unit is contained,(e) at least one condensation catalyst and/or condensation cross-linking agent.After the mixing of the components, the materials according to the invention cure in two steps. At the beginning of mixing, the mixture, in a first state, has a mixer-suitable consistency, whereupon the mixture undergoes transition to a heavier-bodied second state due to condensation reactions of SiOR groups and/or hydrosilylation reactions of alkynyl groups with SiH groups, followed by transition to a third solid, elastic state following curing through a hydrosilylation reaction of alkenyl groups with SiH groups. The invention also relates to mixtures and components comprising further ingredients, as well as methods for the preparation of impressions.

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