Patent EP0434848A1 successfully refreshed from Google Patents.
EP0434848A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Polycarbonate-polydimethylsiloxane copolymer and method of production thereof
Assignee: Idemitsu Kosan Co Ltd
•
Filing: 1990-07-05
•
Granted: —
•
Expires: 2010-07-05
Abstract
Abstract A new copolymer comprising polycarbonate blocks of general formula (I), and polydimethylsiloxane blocks of general formula (II), wherein each symbol is as defined in the specification, having a polydimethylsiloxane block content of 0.5 to 10 wt%, a n-hexane solubles cotent of 1.0 wt% or below, and a viscosity-average molecular weight of 10,000 to 50,000. It has a high impact resistance and gives a molding material with a remarkably high Izod impact strength when mixed with glass fiber or the like.
Inventors
- 👤 Masaya Idemitsu Petrochemical Co. Ltd. Okamoto
- 👤 Takashi Idemitsu Petrochemical Co. Kanesaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 19:12
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/18; C08G77/00; C08G77/42; C08G77/448; C08G64/186; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/14; C08L; C08L69/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
A polycarbonate-polydimethylsiloxane copolymer comprising a polycarbonate block represented by the formula wherein R¹ and R² independently represent hydrogen or an alkyl group having 1 - 4 carbon atoms, R³ and R⁴ independently represent hydrogen, halogen, an alkyl group having 1 - 20 carbon atoms or an aryl group, x denotes an integer of 1 - 5, y denotes an integer of 1 - 4 and n denotes an integer of 1 - 100, and a polydimethylsiloxane block represented by the formula wherein R⁵ and R⁶ independently represent an organic residue having an aromatic nucleus, and m denotes an integer of not less than 100, characterized in that the copolymer has a content of the polydimethylsiloxane block portion of 0.5 - 10% by weight, a n-hexane soluble matter in an amount of 1.0% by weight or less and a viscosity average molecular weight of 10,000 - 50,000.
Claim 2
Dependent Claim
27 words
A polycarbonate-polydimethylsiloxane copolymer according to claim 1, wherein R⁵ and R⁶ independently represent a 3-(o-hydroxyphenyl)propyl group, a 2-(p-hydroxyphenyl)ethyl group or the groups represented by the formula or
Claim 3
Dependent Claim
70 words
A process for preparing the polycarbonate-polydimethylsiloxane copolymer according to claim 1, wherein an organic dihydroxy compound represented by the formula wherein R¹, R² R⁴ and y have the same meanings as defined above, a polydimethylsiloxane represented by the formula wherein R⁵, R⁶ and m have the same meanings as defined above, and a carbonate forming derivative are reacted in a liquid medium in the presence of a molecular weight modifier.
Claim 4
Dependent Claim
27 words
A resin composition comprising 40 - 90% by weight of the polycarbonate-polydimethylsiloxane copolymer according to claim 1 and 60 - 10% by weight of an inorganic filler.
Claim 5
Dependent Claim
19 words
A resin composition according to claim 4, wherein the inorganic filler is a glass fiber or a carbon fiber.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.