Heat-resistant silicone block polymer

• US 4,513,132 A
• Filed: 03/31/1983
• Issued: 04/23/1985
• Est. Priority Date: 04/02/1982
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Takemoto, Issei, Kataoka, Fumio, Shoji, Fusaji, Yokono, Hitoshi, Isogai, Tokio
• Primary Examiner(s): Marquis, Melvyn I.
• Application Number:
  US06/480,789
• Time in Patent Office: 754 Days
• Field of Search: 528/21, 528/33, 528/35, 528/40, 528/41, 528/42, 528/43, 524/731, 525/477
• US Class Current: 528/21
• CPC Class Codes: C08G 77/44 containing only polysiloxane sequences
• CPC Class Codes: C08G 77/52 containing aromatic rings

Abstract

Heat-resistant silicone block polymer with a good flexibility obtained by reaction of an organosilsesquioxane with a silicone compound or organosiloxane in the presence of a basic catalyst in an organic solvent.

Claims

1. A heat-resistant silicone block polymer obtained by reaction of 100 parts by weight of organosilsesquioxane having the following formula (5):

##STR17## wherein R¹ is a lower alkyl group having 1 to 5 carbon atoms and/or an aryl group and n is an integer of from 0 to 4,000, with 5 to 400 parts by weight of a silicone compound or organosiloxane represented by the formula (6) or (7);

##STR18## wherein R² is an arylene group, R³ and R⁴ are lower alkyl groups having 1 to 5 carbon atoms, alkenyl groups and/or aryl groups, and X is a chlorine atom, a hydroxyl group, an alkoxy group or an N,N-dialkylamino group, or ##STR19## wherein R², R³ and R⁴ and X have the same meanings as defined heretofore and p is an integer of from 0 to 100, in an organic solvent and in the presence of 0.1 to 200 parts by weight of a basic catalyst per 100 parts by weight of the compound of the general formula (5).

2. A heat-resistant silicone block polymer according to claim 1, wherein said basic catalyst is selected from the group consisting of pyridine, triethylamine, picoline, quinoline, and N,N-dialkylaniline when X is a chlorine atom, an alkoxy group or an N,N-dialkylamino group in a compound of the formula (6) or (7) and the basic catalyst is selected from the group consisting of pyridine, triethylamine, picoline, quinoline, N,N-dialkylaniline, tetramethylammonium acetate, n-hexylamino-2-ethylhexoate, tetramethylguanidine-di-2-ethylhexoate, piperidine, triethanolamine, and 1,4-diazobicyclo-[2,2,2]-octane when X is a hydroxyl group in the compound of the general formula (6) or (7).

3. A heat-resistant silicone block polymer according to claim 1, wherein the organosilsesquioxane represented by the formula (5) is a hydroxyl-terminated compound selected from the group consisting of phenylsilsesquioxane, chlorophenylsilsesquioxane, diphenylsilsesquioxane, naphthylsilsesquioxane, tolylsilsesquioxane, cyanophenylsilsesquioxane, benzoylphenylsilsesquioxane, p-phenoxyphenylsilsesquioxane, methylsilsesquioxane, ethylsilsesquioxane, propylsilsesquioxane and tertbutylsilsesquioxane;

the compound of the formula (6) is selected from the group consisting of bis(hydroxydimethylsilyl)benzene, bis(hydroxydiphenylsilyl)benzene, bis(hydroxydivinylsilyl)benzene; and

the compound of formula (7) is selected from the group consisting of polytetramethyl-p-silphenylenesiloxane, polytetraphenyl-p-silphenylenesiloxane and polytetravinyl-p-silphenylenesiloxane.

4. A heat-resistant silicone block polymer according to claim 1, wherein said organic solvent is an aromatic hydrocarbon, halogenated alkane and ether, a ketone, a polar solvent or a mixture thereof.

5. A heat-resistant silicone block polymer according to claim 1, wherein said organic solvent is benzene, toluene, methoxybenzene, veratrole, diphenyl, diphenylether, dichloromethane, chloroform, diethylether, diethylpropyl ether, tetrahydrofuran, acetone, methylisobutyl ketone, N-methyl-2-pyrolidone, N-cyclohexyl-2-pyrolidone or a mixture thereof.

6. A heat-resistant silicone block polymer according to claim 1, wherein the reaction is effected at 50°

C. to 200°

C. for 5 to 50 hours.

7. A heat-resistant silicone block polymer according to claim 1, wherein the arylene group is selected from the group consisting of ##STR20## and a xylylene group, and the aryl group is selected from the group consisting of phenyl and tolyl.