Shin-etsu Chemical Co., Ltd.

Shin-etsu Chemical Col, Ltd.

Masatoshi Miyake

Hironao Fujiki

Keisuke Imai

Kenichi Kimura

Masaharu Sato

Shinichi Sato

Tsuneo Kimura

Takafumi Sakamoto

Shunji Aoki

Toshiyuki Ozai

Kazuyuki Suzuki

Koji Yokoo

Mamoru Teshigawara

Nobuhiko Kodana

Masaya Arakawa

Chinami Matsui

Kazukiyo Nagai

Preparation of organoxy-terminated organopolysiloxanes

A room temperature curable organopolysiloxane composition comprising (1) a hydroxyl end-blocked organopolysiloxane having a viscosity of 10-1,000,000 centistokes at 25&deg; C. in admixture with a premix of (2) methyltriacetoxysilane or a partial hydrolyzate thereof as a curing agent and (3) methanol is improved in shelf stability, physical properties and outer appearance as well as adhesion to aluminum.

Room temperature curable organopolysiloxane composition and making method

A hydrolyzable group end-blocked organopolysiloxane is prepared by reacting (A) an organopolysiloxane having a silanol group at each end of its molecular chain with (B) an organosilicon compound having hydrolyzable groups or a partial hydrolyzate thereof in the presence of (C) a condensation catalyst. Use is made of a vibratory mixer comprising a conduit through which a fluid flows in an axial direction and an agitating element disposed in the conduit for reciprocal motion in the flow direction. A reactant mixture of necessary components is introduced into the conduit where the components are vibro-agitated by the agitating element while reaction takes place.

Preparation of hydrolyzable group end-blocked organopolysiloxane

In a process for preparing a one-package RTV organopolysiloxane composition comprising (A) an organopolysiloxane containing at least two Si&mdash;OH groups or hydrolyzable groups, (B) an organosilane having at least two hydrolyzable groups or a partial hydrolyzate thereof, and (C) an inorganic filler, components (A) and (B) are premixed in a substantially anhydrous state, and component (C) is then added to the premix. Despite the absence of sag-control agents, the composition in the uncured state has a sufficient viscosity for sag-control, ease of extrusion, and improved slump properties.

Process for the production of RTV organopolysiloxane compositions

The invention provides an RTV organopolysiloxane composition comprising (A) a terminally di- or trifunctional organopolysiloxane, (B) an alkoxysilane, (C) calcium carbonate surface treated with a carboxylic acid having a melting point of at least 100.degree. C., and (D) a condensation catalyst. The composition cures into a cured product capable of forming a durably thermoresistant and water immersion-resistant bond to substrates such as surface treated aluminum members, fluoro-resin coated steel strips and acrylic resin electrodeposited steel strips.

RTV organopolysiloxane compositions

In an RTV organopolysiloxane composition comprising a hydroxy-terminated diorganopolysiloxane and an organic silicon compound having at least three hydrolyzable groups, there is blended calcium carbonate which has been treated with 1-2.5% by weight of an agent having a melting or softening point of at least 100.degree. C. or a saturated fatty acid having at least 21 carbon atoms. The composition is adhesive to even surface treated aluminum plates and maintain a firm bond under water immersion and at elevated temperatures.

A primer composition comprises (A) an organosilicon compound of the general formula (1) ##STR1## wherein R represents an alkylene group having from 1 to 6 carbon atoms, R.sup.1 represents a divalent hydrocarbon group having not less than 4 carbon atoms, R.sup.2 's may be the same or different and independently represent an unsubstituted or substituted monovalent hydrocarbon group, a is 0 or 1, and b is 0, 1, 2 or 3, and (B) a catalyst for condensation of the organosilicon compound and (C) an organopolysiloxane resin.

Primer composition

Novel aluminosiloxanes having an Al--O--Si linkage, titanosiloxanes having a Ti--O--Si linkage, and stannosiloxanes having a Sn--O--Si linkage in a molecule are provided. Aluminosiloxanes are formed by reacting aluminum alkoxides with cyclotrisiloxanes. Titanosiloxanes are formed by reacting titanium alkoxides with cyclotrisiloxanes. Stannosiloxanes are formed by reacting diorganotin dialkoxides with cyclotrisiloxanes. Reaction processes are simple.

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Gunma-ken, Japan

Masatoshi Miyake