Silicon-containing polymer, process for producing the same, heat-resistant resin composition, and heat-resistant film

1. An alkali-soluble silicon-containing polymer which is represented by general formula (1) below and has a weight-average molecular weight in the range from 500 to 500,000:

wherein A 1 is a phenyl group having a hydroxyl group and/or an alkoxy group; R 1 is an alkylene group of 1-4 carbons; m is 1; R 2 is an alkyl group of 1-4 carbons; R 2 in one molecule is optionally the same type or a combination of two or more different types; each of s and u is a positive number; t is 0 or a positive number; and 0≦t/(s+u)≦1; and 0<u/s ≦5.

2. The alkali-soluble silicon-containing polymer according to claim 1 , wherein 0≦t/(s+u)≦0.2 and 0.2 <u/s ≦5 and said polymer is solid at room temperature.

3. A method for manufacturing the alkali-soluble silicon-containing polymer according to claim 1 , comprising performing hydrolytic co-condensation of s moles of an organosilane having a hydrolysable group represented by general formula (2) below, t moles of an organosilane having a hydrolysable group represented by general formula (3) below, and u moles of a silicon compound having a hydrolysable group represented by general formula (4) below, wherein s and u are positive numbers; t is 0 or a positive number; 0≦t/(s+u)≦1; and 0<u/s ≦5,

A 1 (R 1 ) m SiM 1 3   (2)

wherein A 1 is a phenyl group having either a hydroxyl group or an alkoxy group; R 1 is an alkylene group of 1-4 carbons; M 1 is a hydrolysable group; and m is 1,

wherein R 2 is an alkyl group of 1-4 carbons; and M 2 is a hydrolysable group,

SiM 3 4   (4)

wherein M 3 is a hydrolysable group.

4. The alkali-soluble silicon-containing polymer according to claim 1 , wherein A 1 is a phenyl group having an alkoxy group.

5. The alkali-soluble silicon-containing polymer according to claim 1 , wherein A 1 is selected from the group consisting of o-hydroxyphenyl group, m-hydroxyphenyl group, p-hydroxyphenyl group, 2,3-dihydroxyphenyl group, 2,4-dihydroxyphenyl group, 3,4-dihydroxyphenyl group, 3,5-dihydroxyphenyl group, o-methoxyphenyl group, m-methoxyphenyl group, p-methoxyphenyl group, 2,3-dimethoxyphenyl group, 2,4-dimethoxyphenyl group, 3,4-dimethoxyphenyl group, 3,5-dimethoxyphenyl group, o-ethoxyphenyl group, m-ethoxyphenyl group, p-ethoxyphenyl group, 2,3-diethoxyphenyl group, 2,4-diethoxyphenyl group, 3,4-diethoxyphenyl group, 3,5-diethoxyphenyl group, o-isopropoxyphenyl group, m-isopropoxyphenyl group, p-isopropoxyphenyl group, 2,3-di-isopropoxyphenyl group, 2,4-di-isopropoxyphenyl group, 3,4-di-isopropoxyphenyl group, 3,5-di-isopropoxyphenyl group, ortho-tert-butoxyphenyl group, meta-tert-butoxyphenyl group, p-tert-butoxyphenyl group, 2,3-di-tert-butoxyphenyl group, 2,4-di-tert-butoxyphenyl group, 3,4-di-tert-butoxyphenyl group, 3,5-di-tert butoxyphenyl group, 2-methoxy-3-hydroxyphenyl group, 2-methoxy-4-hydroxyphenyl group, 3-methoxy-4-hydroxyphenyl group, 3-methoxy-5-hydroxyphenyl group, 2-hydroxy-3-methoxyphenyl group, 2-hydroxy-4-methoxyphenyl group, 3-hydroxy-4-methoxyphenyl group, 3-hydroxy-5-methoxyphenyl group, 2-ethoxy-3-hydroxyphenyl group, 2-ethoxy-4-hydroxyphenyl group, 3-ethoxy-4-hydroxyphenyl group, 3-ethoxy-5-hydroxyphenyl group, 2-hydroxy-3-ethoxyphenyl group, 2-hydroxy-4-ethoxyphenyl group, 3-hydroxy-4-ethoxyphenyl group, and 3-hydroxy-5-ethoxyphenyl group.

6. The alkali-soluble silicon-containing polymer according to claim 1 , wherein R 1 is at least one of methylene group, ethylene group, n-propylene group, i-propylene group, n-butylene group and i-butylene group.

7. The alkali-soluble silicon-containing polymer according to claim 1 , wherein R 2 is at least one of methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group.

8. The method according to claim 3 , wherein A 1 is a phenyl group having an alkoxy group.

9. The alkali-soluble silicon-containing polymer according to claim 1 , wherein the polymer is represented by general formula (1) below and has a weight-average molecular weight in the range from 500 to 500,000:

wherein A 1 is a phenyl group having either a hydroxyl group or an alkoxy group; R 1 is an alkylene group of 1-4 carbons; m is 1; R 2 is an alkyl group of 1-4 carbons; R 2 in one molecule is optionally the same type or a combination of two or more different types; each of s and u is a positive number; t is 0 or a positive number; and 0≦t/(s+u)≦1; and 0<u/s≦5.