EP0500129A2
Expired / Lapsed
EP
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Polycarbonate resin solution for film formation by casting
Assignee: Mitsubishi Gas Chemical Co Inc
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Filing: 1992-02-21
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Granted: —
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Expires: 2012-02-21
Abstract
Abstract A polycarbonate resin solution for use in film formation by casting and a process for producing the same are disclosed. The polycarbonate resin solution comprising an organic solvent and dissolved therein a random coplycarbonate resin having a structural unit of formula (1) and a structural unit of formula (2), with the molar ratio of the structural unit of formula (1) to that of formula (2) in all the structural units being from 0.1 to 50% by weight. The polycarbonate resin having a viscosity average molecular weight of from 15,000 to 100,000.
Inventors
- 👤 Satoshi c/o Mitsubishi Gas Chemical Kanayama
- 👤 Noriyoshi c/o Mitsubishi Gas Chemical Ogawa
- 👤 Teruo c/o Mitsubishi Gas Chemical Kawahigashi
- 👤 Toshio c/o Mitsubishi Gas Chemical Okigawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 11:04
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/092; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/085; C08G64/18; C08G64/186; C08G77/00; C08G77/42; C08G77/448; C08J5/00; C08J5/18; C08J2369/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
224 words
A polycarbonate resin solution for use in film formation by casting which comprises an organic solvent and dissolved therein a random copolycarbonate resin having a structural unit represented by the following formula (1), a structural unit represented by the following formula (2), and a structural unit represented by the following formula (3), with the molar ratio of the amount of the structural unit of formula (1) to that of the structural unit of formula (2) being from 35/65 to 65/35 and the content of the structural unit of formula (3) in all the structural units being from 0.1 to 50% by weight, and having a viscosity-average molecular weight of from 15,000 to 100,000: wherein in formulae (1) and (2), R¹ to R⁸ each represents hydrogen atom, a halogen atom, or an alkyl group having from 1 to 4 carbon atoms, X represents a straight-chain, branched, or cyclic alkylidene group having from 1 to 10 carbon atoms, an aryl-substituted alkylidene group, an arylene group, or sulfonyl group, and Y represents oxygen atom or sulfur atom; and in formula (3), R⁹ represents an alkylene or alkylidene group having from 2 to 6 carbon atoms, R¹⁰ and R¹¹ each represents an alkyl group having from 1 to 3 carbon atoms, phenyl group, or a substituted phenyl group, and n is an integer of from 1 to 200.
Claim 2
Dependent Claim
15 words
A solution as claimed in claim 1, wherein said organic solvent is a non-halogenated solvent.
Claim 3
Dependent Claim
20 words
A solution as claimed in claim 1, which has a polycarbonate resin concentration of from 1 to 30% by weight.
Claim 4
Dependent Claim
35 words
A solution as claimed in claim 1, wherein said structural unit represented by formula (1) is derived from a dihydric phenol selected from the group consisting of bisphenol A, 1,1-bis(4-hydroxyphenyl)cyclohexane, α,α-bis(4-hydroxyphenyl)ethylbenzene, 2,2-bis(3-methyl-4-hydroxyphenyl)propane, and bis(4-hydroxyphenyl) sulfone.
Claim 5
Dependent Claim
23 words
A solution as claimed in claim 1, wherein said structural unit represented by formula (2) is derived from bis(4-hydroxyphenyl) ether or bis(3-methyl-4-hydroxyphenyl) ether.
Claim 6
Dependent Claim
23 words
A solution as claimed in claim 1, wherein said structural unit represented by formula (2) is derived from bis(4-hydroxyphenyl) sulfide or bis (3-methyl-4-hydroxyphenyl)sulfide.
Claim 7
Dependent Claim
22 words
A solution as claimed in claim 1, wherein the viscosity-average molecular weight of said random copolycarbonate resin is from 20,000 to 40,000.
Claim 8
Dependent Claim
230 words
A process for producing a polycarbonate resin solution suitable for use in film formation by casting, which comprises copolymerizing a dihydric phenol represented by the following formula (4), a dihydric phenol represented by the following formula (5), and a dihydric phenol represented by the following formula (6), with the molar ratio of the amount of the dihydric phenol of formula (4) to that of the dihydric phenol of formula (5) being from 35/65 to 65/35 and the amount of the dihydric phenol of formula (6) being from 0.1 to 50% by weight based on the total amount of all the dihydric phenols, thereby to produce a random copolycarbonate resin having a viscosity-average molecular weight of from 15,000 to 100,000: wherein in formulae (4) and (5), R¹ to R⁸ each represents hydrogen atom, a halogen atom, or an alkyl group having from 1 to 4 carbon atoms, X represents a straight-chain, branched, or cyclic alkylidene group having from 1 to 10 carbon atoms, an aryl-substituted alkylidene group, an arylene group, or sulfonyl group, and Y represents oxygen atom or sulfur atom; and in formula (6), R⁹ represents an alkylene or alkylidene group having from 2 to 6 carbon atoms, R¹⁰ and R¹¹ each represents an alkyl group having from 1 to 3 carbon atoms, phenyl group, or a substituted phenyl group, and n is an integer of from 1 to 200.
References Cited (Backward Citations)
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