Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
259 words
A soluble silicon polyimide precursor composition which comprises 0.5 to 40% by weight of a silicon polyimide precursor represented by the following formula (I) and having a logarithmic viscosity number of 0.05 to 5 dl/g as measured at a concentration of 0.5 g/dl at 30±0.01° C. in a solvent, 0.5 to 40% by weight of a soluble condensate of a silicon compound represented by the following formula (II) and having a logarithmic viscosity number of 0.01 to 0.5 dl/g, and 50 to 99% by weight of a solvent: ##STR13## wherein G is ##STR14## or a hydrogen atom except in the case of n=0, R 1 is independently a tetravalent carbon cyclic aromatic group, R 2 is independently a carbon cyclic aromatic group, R 3 is ##STR15## R 4 is independently methyl or phenyl, R 7 is independently alkyl having 1 to 6 carbon atoms or hydrogen, X is alkoxy, acetoxy or hydroxyl, n is n≧0, k is 2.5≦k≦3, and m is 3.5<m≦4, the above-mentioned logarithmic viscosity number is ηinh represented by the formula ##EQU3## wherein η is the viscosity measured at 30±0.01° C. at a concentration of 0.5 g/dl in a solvent by the use of a Ubbelohde's viscometer, η o is the viscosity of the solvent at the same temperature by the use of the same viscometer, and C is a concentration of 0.5 g/dl, and the concentration of the condensate of the compound represented by the formula (II) is the concentration of a residual solid after the heating of its solution at 200° C. for 2 hours.
Claim 2
Dependent Claim
259 words
A soluble silicon polyimide precursor composition which comprises 0.5 to 40% by weight of a silicon polyimide precursor represented by the following formula (I) and having a logarithmic viscosity number of 0.05 to 5 dl/g as measured at a concentration of 0.5 g/dl at 30±0.01° C. in a solvent, 0.5 to 40% by weight of a soluble condensate of a silicon compound represented by the following formula (II) and having a logarithmic viscosity number of 0.01 to 0.5 dl/g, and 50 to 99% by weight of a solvent: ##STR13## wherein G is ##STR14## or a hydrogen atom except in the case of n=0, R 1 is independently a tetravalent carbon cyclic aromatic group, R 2 is independently a carbon cyclic aromatic group, R 3 is ##STR15## R 4 is independently methyl or phenyl, R 7 is independently alkyl having 1 to 6 carbon atoms or hydrogen, X is alkoxy, acetoxy or hydroxyl, n is n≧0, k is 2.5≦k≦3, and m is 3.5<m≦4, the above-mentioned logarithmic viscosity number is ηinh represented by the formula ##EQU3## wherein η is the viscosity measured at 30±0.01° C. at a concentration of 0.5 g/dl in a solvent by the use of a Ubbelohde's viscometer, η o is the viscosity of the solvent at the same temperature by the use of the same viscometer, and C is a concentration of 0.5 g/dl, and the concentration of the condensate of the compound represented by the formula (II) is the concentration of a residual solid after the heating of its solution at 200° C. for 2 hours.
Claim 3
Dependent Claim
123 words
A soluble silicon polyimide precursor composition which comprises 0.5 to 40% by weight of an imido group-containing soluble silicon polyimide precursor having a logarithmic viscosity number of 0.05 to 5 dl/g, said precursor being obtained by heating a silicon polyimide precursor represented by the formula (I) of claim 1 at 50° to 200° C. in the presence of a solvent to form an imide or by chemically converting the precursor into an imide in the presence of a known imide formation accelerator, 0.5 to 40% by weight of a soluble condensate of a silicon compound represented by the formula (II) of claim 1 and having a logarithmic viscosity number of 0.01 to 0.5 dl/g, and 50 to 99% by weight of a solvent.
Claim 4
Dependent Claim
18 words
A soluble silicon polyimide precursor composition according to claim 1 wherein k is 3 and m is 4.
Claim 5
Dependent Claim
18 words
A soluble silicon polyimide precursor composition according to claim 2 wherein k is 3 and m is 4.
Claim 6
Dependent Claim
43 words
A method for preparing a crosslinked silicon polyimide which comprises the step of heating the soluble silicon polyimide precursor composition described in claim 1 at a temperature of 50° to 500° C. to evaporate a solvent simultaneously with crosslinking and curing the precursor.
Claim 7
Dependent Claim
43 words
A method for preparing a crosslinked silicon polyimide which comprises the step of heating the soluble silicon polyimide precursor composition described in claim 2 at a temperature of 50° to 500° C. to evaporate a solvent simultaneously with crosslinking and curing the precursor.