Method for the preparation of a silicone-based pressure-sensitiv

Details Method for the preparation of a silicone-based pressure-sensitiv Method for the preparation of a silicone-based pressure-sensitiv

1989-01-17

1990-07-24

Marquis, Melvyn I.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528 21, 528 24, C08F28300

Patent

active

049436201

ABSTRACT:
The invention proposes use of ammonia water in place of a conventional caustic alkali or amine compound as a catalyst in the siloxane rearrangement reaction for the preparation of a silicone-based pressure-sensitive adhesive between a poly(diorganosiloxane) having a linear molecular structure and another organopolysiloxane composed mainly of the monofunctional organosiloxane units and tetrafunctional siloxane units. The ammonia water after completion of the reaction can be easily and completely removed by distillation so that the resultant adhesive product is free from any alkaline residue of the catalyst to be imparted with greatly improved stability against viscosity changes and excellent electrical properties along with high reproducibility of the product quality.

REFERENCES:
patent: 3231542 (1966-01-01), Elsinger et al.
patent: 4222917 (1980-09-01), Razzano et al.

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