General Electric Company

Alfred H Smith, Jr

John H Wright

Steven H Klein

M Dale Beers

Edward M Jeram

Tyrone D Mitchell

John J Dziark

Warren R Lampe

George P De Zuba

A process for producing a shelf-stable catalyst component for a room temperature vulcanizable silicone rubber composition comprising (a) mixing a organopolysiloxane fluid with first from 1 to 15 percent by weight of the total amounts of the following ingredients (1) an alkyl silicate cross-linking agent (2) a catalytic promoter which is a tin salt and (3) a self-bonding additive which is nitrogen-functional self-bonding additive until there is a uniform mixture; (b) adding to the mixture from 10 to 250 parts of filler and mixing the ingredients to a uniform mixture wherein the mixture is heated at a temperature of at least 100.degree. C. for at least 1 hour so as to drive off moisture and form a stable base mixture and then adding to the stable base mixture the rest of the cross-linking agent, the catalytic promoter and the shelf-bonding additive to form a self-stable uniform mixture.

Shelf-stable catalyst component for RTV silicone composition

A protective lubricating composition is provided which will penetrate readily to closely fitting frictional parts but which will turn to a protective, non-migrating lubricating gel in use. Preferred embodiments may contain silicone fluids, extreme pressure compounds and surfactants, and may be combined with solvents and propellants to make a sprayable lubricant composition.

Protective lubricant composition

An addition curing silicone composition with a low viscosity in the uncured state and high physical strength in the cured state comprising a vinyl-containing diorganopolysiloxane polymer, a platinum catalyst, a hydride cross-linking agent and a linear hydride coupler in which the viscosity of the linear hydride coupler varies from 1 to 1,000 centipoise at 25.degree. C.

Addition curing silicone compositions

A shelf-stable catalyst composition for a one-part room temperature vulcanizable silicone rubber composition comprising the reaction product of an adhesion promoter selected from the class consisting of silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates and silyl cyanurates and with an acyloxy functional cross-linking agent.

Shelf-stable one-part room temperature vulcanizable silicone rubber

A paintable one-component room temperature vulcanizable silicone rubber composition comprising a silanol end-stopped polymer; as the basic filler, calcium carbonate; as a cross-linking agent, an acyloxy functional silane wherein the acyloxy group has from 2 to 30 carbon atoms, and a tin salt of a carboxylic acid as the curing catalyst.

Paintable one-component RTV systems

A self-bonding room temperature vulcanizable silicone rubber composition comprising a silanol-terminated diorganopolysiloxane base polymer, a filler, a crosslinking agent selected from carboxyl functional silanes and hydrocarbonoxy functional silanes, a curing catalyst and as the self-bonding additive a silyl maleate or a silyl fumarate or a silyl succinate. In place of the foregoing silane self-bonding additives there may be utilized as a self-bonding additive, a maleate functional polysiloxane, a fumarate functional polysiloxane or a succinate functional polysiloxane.

Self-bonding room temperature vulcanizable silicone rubber compositions

A room temperature vulcanizable silicone rubber composition with sag-control wherein the base material or mixture of ingredients for forming the composition comprises a silanol end-stopped diorganopolysiloxane polymer, at least 3 parts of a fumed silica filler and as the sag-control ingredient, from 0.03 to 2.0 parts of a polyether. As a work-like extending additive in the case of a two-part room temperature vulcanizable silicone rubber composition, there may be added to the basic ingredients of the composition a low viscosity silanol end-stopped polysiloxane.

Room temperature vulcanizable silicone rubber compositions with

There is provided by the present invention a method for adhering silicone compositions to various substrates and more specifically to plastic substrates by the utilization of a primer composition which is a reaction product of methyl or butyl methacrylate or butyl acrylate and an acrylate functional silane, where in such reaction product mixture there is some of the acrylate functional silane monomer present.

Primer compositions for adhering silicone compositions

The present invention relates to a one-component room temperature vulcanizable silicone composition which has a low moisture vapor transmission rate which is accomplished by mixing with a silanol-terminated diorganiopolysiloxane Polymer from 75 to 150 parts of mica with optionally up to 30% by weight of talc, per 100 parts of the silanol-terminated diorganopolysiloxane polymer. In this composition there can be utilized any of the known cross-linking agents for one-component room temperature vulcanizable silicone rubber compositions such as, acyloxy functional silanes, alkoxy functional silanes, ketoximino functional silanes, amide functional silanes, tert-alkoxy functional silanes and amine functional silanes.

Low temperature transmission room temperature vulcanizable silicone

A low moisture vapor transmission rate room temperature vulcanizable silicone composition comprising a silanol end-stopped diorganopolysiloxane with optionally a reinforcing or extending filler, an alkyl silicate crosslinking agent or in the alternative a co-polymer composed of monofunctional and tetrafunctional units and a catalyst which is the metal salt of carboxylic acid such as dibutyl tin dilaurate where the improvement comprises having in such a composition from 75 to 150 parts by weight of a vapor barrier filler which is mica with optionally up to 30% by weight of said vapor barrier filler being talc, wherein the above concentration of filler is based upon 100 parts of the silanol end-stopped diorganopolysiloxane polymer. Also in the present invention there is envisioned as SiH Olefin platinum catalyzed composition which has the foregoing mica as a vapor barrier filler.

Growing community of inventors

Ballston Lake, NY, United States of America

Alfred H Smith, Jr