The present disclosure provides a curable silicone rubber composition containing 0.1 to 15 mass % of a biuret compound represented by the general formula disclosed herein, wherein R.sup.1 represents the same or different alkyl groups having 1 to 6 carbons, R.sup.2 represents the same or different alkyl groups having 1 to 3 carbons, R.sup.3 represents the same or different alkylene groups having 2 to 6 carbons, and a represents the same or different integers of from 0 to 2. The curable silicone rubber composition may be cured by a condensation reaction, an addition reaction, or the like. The curable silicone rubber composition generally has good adhesion to plastics, metals, and the like.

The present disclosure provides a curable silicone rubber composition containing 0.1 to 15 mass % of a biuret compound represented by the general formula disclosed herein, wherein R.sup.1 represents the same or different alkyl groups having 1 to 6 carbons, R.sup.2 represents the same or different alkyl groups having 1 to 3 carbons, R.sup.3 represents the same or different alkylene groups having 2 to 6 carbons, and a represents the same or different integers of from 0 to 2. The curable silicone rubber composition may be cured by a condensation reaction, an addition reaction, or the like. The curable silicone rubber composition generally has good adhesion to plastics, metals, and the like.

The present disclosure provides a curable silicone rubber composition containing 0.1 to 15 mass % of a biuret compound represented by the general formula disclosed herein, wherein R.sup.1 represents the same or different alkyl groups having 1 to 6 carbons, R.sup.2 represents the same or different alkyl groups having 1 to 3 carbons, R.sup.3 represents the same or different alkylene groups having 2 to 6 carbons, and a represents the same or different integers of from 0 to 2. The curable silicone rubber composition may be cured by a condensation reaction, an addition reaction, or the like. The curable silicone rubber composition generally has good adhesion to plastics, metals, and the like.

The invention relates to a curable composition, containing (A) at least one polyorganosiloxane, which has at least one hydroxy group bound to a silicon atom, (B) at least one silane of the formula (1):
Si(R.sup.1).sub.m(R.sup.2).sub.n(R.sup.3).sub.4-(m+n)(1), as defined herein, (C) at least one aminosilane, and (D) at least one tin compound,
whereby the molar ratio of the aminosilane to the tin compound is 1:1 to 50:1, as well as to the preparation and use thereof.

Methods of making prepregs are described. The methods include the steps of forming a fiber-containing substrate, and contacting the fiber-containing substrate with a resin mixture. The resin mixture may include polymer particles mixed in a liquid medium, and the polymer particles may be coated on the fiber-containing substrate to form a coated substrate. The liquid medium may be removed from the coated substrate to form the prepreg. The prepregs may be used to make fiber-reinforced articles.

Methods of making prepregs are described. The methods include the steps of forming a fiber-containing substrate, and contacting the fiber-containing substrate with a resin mixture. The resin mixture may include polymer particles mixed in a liquid medium, and the polymer particles may be coated on the fiber-containing substrate to form a coated substrate. The liquid medium may be removed from the coated substrate to form the prepreg. The prepregs may be used to make fiber-reinforced articles.

A resin composition including the following components (a) and (b). (a) A polyimide precursor having a structural unit represented by the following general formula (1); and (b) a compound represented by the following general formula (2): wherein in the formula R.sup.1 is a tetravalent organic group, R.sup.2 is a divalent organic group and R.sup.3 and R.sup.4 are independently a hydrogen atom, an alkyl group, a cycloalkyl group or a monovalent organic group having a carbon-carbon unsaturated double bond. R.sup.5 is an alkyl group having 1 to 4 carbon atoms, R.sup.6 is independently a hydroxyl group or an alkyl group having 1 to 4 carbon atoms, a is an integer of 0 to 3, n is an integer of 1 to 6, and R.sup.7 is a group represented by the following general formula (3) or (4): wherein in the formula (3) or (4), R.sup.8 is an alkyl group having 1 to 10 carbon atoms or a monovalent organic group derived from hydroxyalkylsilane and R.sup.9 is an alkyl group having 1 to 10 carbon atoms, a monovalent organic group derived from aminoalkylsilane or a heterocyclic group, and R.sup.8 and R.sup.9 may independently have a substituent. ##STR00001##

A resin composition including the following components (a) and (b). (a) A polyimide precursor having a structural unit represented by the following general formula (1); and (b) a compound represented by the following general formula (2): wherein in the formula R.sup.1 is a tetravalent organic group, R.sup.2 is a divalent organic group and R.sup.3 and R.sup.4 are independently a hydrogen atom, an alkyl group, a cycloalkyl group or a monovalent organic group having a carbon-carbon unsaturated double bond. R.sup.5 is an alkyl group having 1 to 4 carbon atoms, R.sup.6 is independently a hydroxyl group or an alkyl group having 1 to 4 carbon atoms, a is an integer of 0 to 3, n is an integer of 1 to 6, and R.sup.7 is a group represented by the following general formula (3) or (4): wherein in the formula (3) or (4), R.sup.8 is an alkyl group having 1 to 10 carbon atoms or a monovalent organic group derived from hydroxyalkylsilane and R.sup.9 is an alkyl group having 1 to 10 carbon atoms, a monovalent organic group derived from aminoalkylsilane or a heterocyclic group, and R.sup.8 and R.sup.9 may independently have a substituent. ##STR00001##

A resin composition including the following components (a) and (b). (a) A polyimide precursor having a structural unit represented by the following general formula (1); and (b) a compound represented by the following general formula (2): wherein in the formula R.sup.1 is a tetravalent organic group, R.sup.2 is a divalent organic group and R.sup.3 and R.sup.4 are independently a hydrogen atom, an alkyl group, a cycloalkyl group or a monovalent organic group having a carbon-carbon unsaturated double bond. R.sup.5 is an alkyl group having 1 to 4 carbon atoms, R.sup.6 is independently a hydroxyl group or an alkyl group having 1 to 4 carbon atoms, a is an integer of 0 to 3, n is an integer of 1 to 6, and R.sup.7 is a group represented by the following general formula (3) or (4): wherein in the formula (3) or (4), R.sup.8 is an alkyl group having 1 to 10 carbon atoms or a monovalent organic group derived from hydroxyalkylsilane and R.sup.9 is an alkyl group having 1 to 10 carbon atoms, a monovalent organic group derived from aminoalkylsilane or a heterocyclic group, and R.sup.8 and R.sup.9 may independently have a substituent. ##STR00001##

Provided is an addition-curable silicone rubber composition for airbags. An addition-curable silicone rubber composition which contains: 100 parts by mass of (A) an organopolysiloxane that contains two or more alkenyl groups in each molecule; (B) a cyclic organohydrogenpolysiloxane represented by formula (1),

##STR00001##

wherein the polysiloxane content is 50 mol % or more relative to the total amount of the component (B) when m=2; (C) an organohydrogenpolysiloxane represented by formula (2),

R.sup.2.sub.eH.sub.fSiO.sub.(4-e-f)/2(2)

which contains two or more silicon atom-bonded hydrogen atoms in each molecule, in such an amount that the number of silicon atom-bonded hydrogen atoms in the components (B) and (C) is 1 to 7 per one silicon atom-bonded alkenyl group in the component (A) and the number of silicon atom-bonded hydrogen atoms in the component (B) is 1-30% of the number of silicon atom-bonded hydrogen atoms in the components (B) and (C); 0.1-50 parts by mass of (D) a fine silica powder having a BET specific surface area of 50 m.sup.2/g or more; and an effective amount of (E) an addition reaction catalyst.