A composition for forming a release coating is disclosed. The composition comprises (A) an organopolysiloxane comprising the reaction product of: (i) a silicone resin having a particular formula; and (ii) a cyclic siloxane; in the presence of a polymerization catalyst. The composition further comprises (B) an organopolysiloxane including an average of at least two silicon-bonded ethylenically unsaturated groups per molecule.

A composition for forming a release coating is disclosed. The composition comprises (A) an organopolysiloxane comprising the reaction product of: (i) a silicone resin having a particular formula; and (ii) a cyclic siloxane; in the presence of a polymerization catalyst. The composition further comprises (B) an organopolysiloxane including an average of at least two silicon-bonded ethylenically unsaturated groups per molecule.

A curable organopolysiloxane composition that is one component, has superior storage stability, favorable curability and adhesion at relatively low temperatures, and an appropriate usable time is provided. In particular, the composition has excellent curability even at temperatures of 80° C. or lower and excellent adhesion to resins such as polyester and polyphenylene sulfide. The composition comprises: (A) an organopolysiloxane having at least two alkenyl groups in each molecule thereof; (B) an organopolysiloxane having at least two silicon atom-bonded hydrogen atoms in a molecule; (C) a hydrosilylation reaction catalyst; (D) a condensation reaction catalyst or a condensation reaction product thereof selected from the group consisting of tetra-tert-butoxy titanium, di(isopropoxy)bis(ethyl acetoacetate)titanium, and an aluminum chelate complex; and (E) a curing inhibitor. When cured, the composition provides a silicone rubber composition with a JIS A hardness of 5 or higher. The composition may include a large amount of (H) inorganic filler or the like.

A curable organopolysiloxane composition that is one component, has superior storage stability, favorable curability and adhesion at relatively low temperatures, and an appropriate usable time is provided. In particular, the composition has excellent curability even at temperatures of 80° C. or lower and excellent adhesion to resins such as polyester and polyphenylene sulfide. The composition comprises: (A) an organopolysiloxane having at least two alkenyl groups in each molecule thereof; (B) an organopolysiloxane having at least two silicon atom-bonded hydrogen atoms in a molecule; (C) a hydrosilylation reaction catalyst; (D) a condensation reaction catalyst or a condensation reaction product thereof selected from the group consisting of tetra-tert-butoxy titanium, di(isopropoxy)bis(ethyl acetoacetate)titanium, and an aluminum chelate complex; and (E) a curing inhibitor. When cured, the composition provides a silicone rubber composition with a JIS A hardness of 5 or higher. The composition may include a large amount of (H) inorganic filler or the like.

One of the objects of the present invention is to provide a thermally conductive silicone resin composition which has good thermal conductivity, a light weight (namely, a light weight per unit volume), and good reliability in high humidity, and a molded body thereof. The present invention provides a thermally conductive silicone resin composition comprising the following components (A) to (E): (A) an organopolysiloxane having at least two alkenyl groups each bonded to a silicon atom in an amount of 100 parts by mass, (B) an organohydrogen polysiloxane having at least two hydrogen atoms each bonded to a silicon atom in an amount such that a ratio of the number of the hydrogen atom bonded to a silicon atom relative to the number of the alkenyl group in component (A) is 0.1 to 2, (C) a thermally conductive filler in an amount of 2500 to 6000 parts by mass, (D) a catalytic amount of an addition reaction catalyst, and (E) an addition-reaction controlling agent in an amount of 0.01 to 1 part by mass, wherein the thermally conductive filler (C) comprises magnesium oxide having a specific surface area of 0.4 m.sup.2/g or less in an amount of 20 to 50 wt % and aluminum hydroxide in an amount of 10 to 30 wt %, relative to a total weight of component (C).

One of the objects of the present invention is to provide a thermally conductive silicone resin composition which has good thermal conductivity, a light weight (namely, a light weight per unit volume), and good reliability in high humidity, and a molded body thereof. The present invention provides a thermally conductive silicone resin composition comprising the following components (A) to (E): (A) an organopolysiloxane having at least two alkenyl groups each bonded to a silicon atom in an amount of 100 parts by mass, (B) an organohydrogen polysiloxane having at least two hydrogen atoms each bonded to a silicon atom in an amount such that a ratio of the number of the hydrogen atom bonded to a silicon atom relative to the number of the alkenyl group in component (A) is 0.1 to 2, (C) a thermally conductive filler in an amount of 2500 to 6000 parts by mass, (D) a catalytic amount of an addition reaction catalyst, and (E) an addition-reaction controlling agent in an amount of 0.01 to 1 part by mass, wherein the thermally conductive filler (C) comprises magnesium oxide having a specific surface area of 0.4 m.sup.2/g or less in an amount of 20 to 50 wt % and aluminum hydroxide in an amount of 10 to 30 wt %, relative to a total weight of component (C).

The invention relates to a pre-impregnated fibre-reinforced composite material in laminar form, obtained impregnating a fibrous mass with a polymeric binder composition and intended to be subjected to successive forming and complete curing operations to produce a fibre-reinforced composite material. The polymeric binder composition comprises one or more resins chosen in the group consisting of siloxane resins and silsesquioxane resins, and can optionally comprise one or more organic resins. The polymeric binder composition appears as a liquid with viscosity between 55000 and 10000 mPas at temperatures between 50° C. and 70° C. The polymeric binder composition forms a polymeric binder matrix, not cross-linked or only partially cross-linked, that fills the interstices of the fibrous mass. The invention also relates to a method for making said pre-impregnated fibre-reinforced composite material in laminar form. The invention also relates to a manufactured article obtained by hot forming and complete curing of the aforesaid pre-impregnated fibre-reinforced composite material, as well as a method for making said manufactured article.

The invention relates to a pre-impregnated fibre-reinforced composite material in laminar form, obtained impregnating a fibrous mass with a polymeric binder composition and intended to be subjected to successive forming and complete curing operations to produce a fibre-reinforced composite material. The polymeric binder composition comprises one or more resins chosen in the group consisting of siloxane resins and silsesquioxane resins, and can optionally comprise one or more organic resins. The polymeric binder composition appears as a liquid with viscosity between 55000 and 10000 mPas at temperatures between 50° C. and 70° C. The polymeric binder composition forms a polymeric binder matrix, not cross-linked or only partially cross-linked, that fills the interstices of the fibrous mass. The invention also relates to a method for making said pre-impregnated fibre-reinforced composite material in laminar form. The invention also relates to a manufactured article obtained by hot forming and complete curing of the aforesaid pre-impregnated fibre-reinforced composite material, as well as a method for making said manufactured article.

A polymer composition comprising at least one liquid crystalline polymer and an ultrahigh molecular weight siloxane polymer in an amount from about 0.1 to about 20 parts by weight per 100 parts by weight of the liquid crystalline polymer is provided. The siloxane polymer has a number average molecular weight of about 100,000 grams per mole or more.

A polymer composition comprising at least one liquid crystalline polymer and an ultrahigh molecular weight siloxane polymer in an amount from about 0.1 to about 20 parts by weight per 100 parts by weight of the liquid crystalline polymer is provided. The siloxane polymer has a number average molecular weight of about 100,000 grams per mole or more.