Patent ID: 6930393
Filing Date: 2005-08-16
Classification: H01L

Abstract:
1. A porous film-forming composilion comprising (A) and (B): (A) 100 parts by weight of at least one hydrolyzable silicon compound or at least one product resulting from at least partial hydrolysis condensation of the silicon compound or both selected from the group consisting of compounds expressed by the following formulae (1) and (2): wherein each Z 1 denotes independently a hydrolyzable group, and when the compound (1) includes more than one Z 1 , each Z 1 may be identical or different; each R 1 denotes independently a substituted or non-substituted monovalent hydrocarbon group, and when the compound (1) includes more than one R 1 , each R 1 may be identical or different; and a is an integer from 0 to 3; and wherein Z 21 and Z 22 each denotes independently a hydrolyzable group, and when the compound (2) includes more than one Z 21 or Z 22 or both each Z 21 or Z 22 or both may be identical or different; R 21 and R 22 each denotes independently a substituted or non-substituted monovalent hydrocarbon group, and when the compound (2) includes more than one R 21 or R 22 or both, each R 21 or R 22 or both may be identical or different; each of b and c denotes independently an integer from 0 to 2; and Y is an oxygen atom, a phenylene group, or a divalent hydrocarbon group; and (B) 0.1 to 20 parts by weight of a cross-linking agent comprising at least one cyclic or multiple-branched oligomer which can generate one or more silanol groups by heating and which is selected from the group consisting of oligomers expressed by following formulae (3) to (8), wherein the oligomers: wherein R 31 and R 32 each denotes independently a substituted or non-substituted monovalent hydrocarbon group, and when the compound (3) includes more than one R 31 or R 32 or both each R 31 or R 32 or both may be identical or different; Z 3 denotes independently a group which can generate silanol by heating, and when the compound (3) includes more than one Z 3 each Z 3 may be identical or different; and each d and e denotes independently an integer from 0 to 10, and a sum of d and e is greater than or equal to three; wherein R 41 , R 42 and R 43 each denotes independently a substituted or non-substituted monovalent hydrocarbon group, and when the compound (4) includes more than one R 41 R 42 or R 43 or any combination thereof, each R 41 R 42 or R 43 or any combination thereof may be identical or different; Z 4 denotes independently a group which can generate silanol by heating, and when the compound (4) includes more than one Z 4 each Z 4 may be identical or different; and each f, g and h denotes independently an integer from 0 to 10, a sum of f, g and b is greater than or equal to four, and f is an even number; wherein Z 5 denotes independently a group which can generate silanol by heating, and when the compound (5) includes more than one Z 5 each Z 5 may be identical or different; and each i and j denotes independently an integer from 0 to 10, a sum of i and j is greater than or equal to four, and a sum of i and j is an even number; wherein R 61 and R 62 each denotes independently a substituted or non-substituted monovalent hydrocarbon group, and when the compound (6) includes more than one R 61 or R 62 or both, each R 61 or R 62 or both may be identical or different; Z 61 and Z 62 each denotes independently a group which can generate silanol by heating, and when the compound (6) includes more than one Z 61 or Z 62 or both, each Z 61 or Z 62 or both may be identical or different; and each k, m, n and p denotes independently an integer from 0 to 20, a sum of k, m, n and p is greater than or equal to five, and a sum of k, m and n is an even number; wherein Z 71 and Z 72 each denotes independently a group which can generate silanol by heating, and when the compound (7) includes more than one Z 71 or Z 72 or both, each Z 71 or Z 72 or both may be identical or different; and each q, r, s and t denotes independently an integer from 0 to 20, a sum of q, r, s and t is greater than or equal to four, and a sum of q, r and t is an even numbers; and wherein R 81 , R 82 and R 83 each denotes independently a substituted or non-substituted monovalent hydrocarbon group, and when the compound (8) includes more than one R 81 , R 82 or R 83 or any combination thereof, each R 81 , R 82 or R 83 or any combination thereof may be identical or different; each Z 81 , Z 82 and Z 83 denotes independently a group which can generate silanol by heating, and when the compound (8) includes more than one Z 81 , Z 82 or Z 83 or any combination thereof, each Z 81 , Z 82 or Z 83 or any combination thereof may be identical or different; and each u, v, w, x, y and z denotes independently an integer from 0 to 20, a sum of u, v, w, x, y and z is greater than or equal to three, and a sum of u, w and z is an even number.