Shin-Etsu Chemical Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Shinichi Satoh

Masatoshi Arai

Toshio Takago

Kazutoshi Fujioka

Noriyuki Koike

Takashi Matsuda

Koichi Yamaguchi

Hideki Fujii

Masayuki Oyama

Tsuneo Kimura

Hitoshi Kinami

Kazuyuki Suzuki

Seiji Shimada

Kesao Ide

Tatsuya Kagosaki

Novel fluorinated carboxylic acid derivatives of the general formula: ##STR1## wherein Rf is a divalent perfluoroalkyl or perfluoropolyether group and Z is halogen, hydroxyl or triorganosiloxy are useful intermediate for the synthesis of various fluorinated compounds. Compounds [I-i] wherein Z in formula [I] is F are prepared by reacting acid fluoride-terminated compounds of the formula: ##STR2## with an alkali fluoride and further with an allyl halide. Compounds [I-ii] wherein Z in formula [I] is a halogen are preparred by reacting compounds [I-i] with lithium halide. Compounds [I-iii] wherein Z in formula [I] is OH are prepared through hydrolysis of compounds [I-ii]. Compounds [I-iv] wherein Z in formula [I] is triorganosiloxy are prepared by reacting compounds [I-iii] with a triorganosilylating agent.

Fluorinated carboxylic acid derivatives and methods for making

A mixture of (A) a diorganopolysiloxane end-blocked with a hydroxyl group, (B) an .alpha.,.beta.-substituted vinyloxysilane, or a hydrolyzate thereof, and (C) a perfluorocarboxylic acid derivative provides an RTV organopolysiloxane composition which is stable and non-corrosive to metal.

RTV organopolysiloxane compositions

An organosilicon compound having the general formula (I): ##STR1## wherein R.sup.1 represents the methyl group or the ethyl group, R.sup.2 represent an alkyl group having from 1 to 4 carbon atoms, and n represents an integer of from 1 to 3. This compound is useful in preparing room temperature vulcaniazable organopolisiloxane compositions which have good storage stability, and release no smelly or corrosive condensation by-product on curing.

Organosilicon compound

Novel fluorinated carboxylic acid derivatives of the general formula: ##STR1## wherein R.sup.1 and R.sup.2 are independently selected from substituted or unsubstituted monovalent hydrocarbon groups, Rf is a divalent perfluoroalkyl or perfluoropolyether group, X is a hydrogen atom or triorganosilyl group, and a is equal to 2 or 3 are useful curing catalysts for RTV organopolysiloxane compositions. These fluorinated carboxylic acid derivatives are prepared by effecting hydrosilylation between alkenyl-containing fluorinated carboxylic acid derivatives and hydrosilanes in the presence of catalysts.

An organosilicon compound having the general formula (I): ##STR1## wherein R.sup.1 represents the methyl group or the ethyl group, R.sup.2 represents an alkyl group having from 1 to 4 carbon atoms, and n represents an integer of from 1 to 3. This compound is useful in preparing room temperature vulcanizable organopolisiloxane compositions which have good storage stability, and release no smelly or corrosive condensation by-product on curing.

A process for producing an .alpha., .omega.-hydroxyfluoroalkylpolysiloxane comprising polymerizing a cyclotrisiloxane in the presence of a polymerization catalyst of lithium hydroxide or a lithium salt of a diorganosiloxane, and a promoter of phtalic diorganoester and/or ortho-dialkoxybenzene, and stopping the polymerization by adding a neutralizer is disclosed. This process very easily obtains the .alpha., .omega.-hydroxyfluoroalkylpolysiloxane of a desired viscosity. If a chloroethane of the general formula CHX, CCl X.sub.2 (X is the hydrogen or chlorine atom) is used as the neutralizer, the .alpha., .omega.-hydroxyfluoroalkylpolysiloxane does not exhibit any substantial change of viscosity over time.

Process for producing .alpha., .omega.-hydroxyfluoroalkylpolysiloxanes

A room temperature-curable organopolysiloxane composition, which is capable of giving a cured silicone rubber having excellent resistance against oils, e.g., automobile engine oil, and little responsible for foaming of the oil contaminated with the silicone rubber, can be prepared by first blending a silanol-terminated dimethyl polysiloxane, an iminoxy-substituted organosilane compound, e.g., vinyl tributanoxime silane, an organotin compound as a catalyst and an inorganic filler. e.g, zinc oxide, to give a uniform mixture and further admixing the uniform mixture with a trimethylsilyl-terminated dimethyl polysiloxane, an alkenyloxy-substituted organosilane compound, e.g., vinyl triisopropenyloxy silane, and a methyl polysiloxane having a network structure of the molecules as consisting of the monofunctional units of the formula (CH.sub.3).sub.3 SiO.sub.0.5 and tetrafunctional units of the formula SiO.sub.2 each in a specified amount.

Room temperature-curable organopolysiloxane composition and method for

A room temperature vulcanizable organopolysiloxane composition capable of yielding a cured product exhibiting an improved resistance to oil and improved adhesiveness to metals, which comprises a diorganopolysiloxane blocked with a hydroxyl group at both ends of the molecule, an organosilane or siloxane having at least two hydrolyzable groups, each bonded to a silicone atom, in one molecule, and an organosilane or siloxane having at least one vinyl group and at least one hydroxyl group, each bonded to a silicon atom, in one molecule. The composition may further comprise a filler.

Room temperature vulcanizable organopolysiloxane composition

The ultraviolet-curable organopolysiloxane composition comprises (A) a first organopolysiloxane having, in a molecule, at least one isopropenyloxysilyl-substituted ethyl or propyl group, (B) a second organopolysiloxane having, in a molecule, at least 2 silicon-bonded mercaptoalkyl groups, (C) an organosilicon compound having at leaast one vinyl group in a molecule and (D) a photosensitizer. The composition can be rapidly cured by exposure to ultraviolet light into a cured silicone rubber body without the problems and disadvantages in the conventional ultraviolet-curable silicone rubber compositions.

Ultraviolet-curable organopolysiloxane composition

An organosilicon compound represented by the general formula (I): ##STR1## wherein R.sup.1 may be the same or different and represents an alkyl group having 1 to 8 carbon atoms; R.sup.2 and R.sup.3 may be the same or different and represents an alkylene group having 1 to 8 carbon atoms; and R.sup.4 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, and a process for preparing the same. This compound is useful for improving adhesive properties of UV curable silicone compositions and the like.

An organosilicon compound represented by General Formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 may be the same or different, and each represent a substituted or unsubstituted monovalent hydrocarbon group, x and y each represent an integer of 1 to 3, and n is an integer of 0 or more. This compound is useful as a starting material for ultraviolet curable silicone compositions and room temperature curable silicone compositions.

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Annaka, Japan

Shinichi Satoh