US4855377A
Expired / Lapsed
US
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Novel copolycarbonate
Assignee: Asahi Kasei Corp
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Filing: 1988-08-03
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Granted: 1989-08-08
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Expires: 2008-08-03
Abstract
Abstract A novel copolycarbonate is provided, which comprises recurring units respectively of the formulae: ##STR1## in a molar ratio of units (A) to units (B) of from 9:1 to 1:9. The copolycarbonate has a number average molecular weight of from 300 to 50,000. The copolycarbonate is useful as a reactive polymer for producing final polymers such as a polyurethane and a thermoplastic elastomer. The copolycarbonate as well as various final polymers produced therefrom have excellent resistance to hydrolysis, light, chlorine, oxidative degradation, heat, etc. The polyurethane and the thermoplastic elastomer containing units of the novel copolycarbonate as soft segments exhibit remarkably improved flexibility and elastic recovery as compared to those of the conventional polymers.
Inventors
- 👤 Masahisa Yokota
- 👤 Atsushi Shimizu
- 👤 Kyosuke Komiya
- 👤 Kazunori Yamataka
- 👤 Tadanori Nonura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:28
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/44; C08G64/00; C08G64/02; C08G64/0208; C08G64/0216; C08G64/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
44 words
A copolycarbonate comprising recurring units respectively of the formulae: ##STR27## and terminal groups, the molar ratio of units (A) to units (B) being in the range of from 9:1 to 1:9, the copolycarbonate having a number average molecular weight of from 300 to 50,000.
Claim 2
Dependent Claim
44 words
A copolycarbonate comprising recurring units respectively of the formulae: ##STR27## and terminal groups, the molar ratio of units (A) to units (B) being in the range of from 9:1 to 1:9, the copolycarbonate having a number average molecular weight of from 300 to 50,000.
Claim 3
Dependent Claim
20 words
A copolycarbonate according to claim 1, wherein the molar ratio of units (A) to units (B) is 75:25 to 15:85.
Claim 4
Dependent Claim
123 words
A copolycarbonate according to claim 1, wherein each terminal group is a member selected from the group consisting of a hyrdoxyl group, a carboxyl group, an acryloyl group, a methacryloyl group, an allyl group, an alkyl carbonate group having 2 to 11 carbon atoms, an aryl carbonate group having 7 to 11 carbon atoms, and a substituted silyl group of the formula ##STR28## wherein R is a hyrdogen atom or a monovalent hydrocarbon residue having 1 to 10 carbon atoms, each Y is independently a member selected from the group consisting of a halogen atom, an alkoxy group, a phenoxy group, an acyloxy group, an aminoxy group, a thioalkoxy group and an amino group, and a is an integer of 1 to 3.
Claim 5
Dependent Claim
16 words
A copolycarbonate according to claim 1, wherein substantially all of said terminal groups are hydroxyl groups.
Claim 6
Dependent Claim
16 words
A copolycarbonate according to claim 1, wherein substantially all of said terminal groups are carboxyl groups.
Claim 7
Dependent Claim
40 words
A polyurethane comprising a polyisocyanate component, a polyol component which is copolycarbonate of claim 4, and, optionally, a chain extender component having at least two hydrogen atoms per molecule which are bound to the isocyanate groups of said polyisocyanate component.
Claim 8
Dependent Claim
22 words
A polyamide-polycarbonate block copolymer comprising a polycarbonate block which is comprised mainly of a copolycarbonate of claim 5, and a polyamide block.
Claim 9
Dependent Claim
22 words
A polyester-polycarbonate block copolymer comprising a polycarbonate block which is comprised mainly of a copolycarbonate of claim 4, and a polyester block.
Claim 10
Independent Claim
124 words
A method for preparing a copolycarbonate polyol comprising recurring units respectively of the formulae: ##STR29## and terminal groups, the molar proportion of units (A) to units (B) being in the range of from 9:1 to 1:9, substantially all of said terminal groups being hydroxyl groups, which comprises the steps of: (1) heating a mixture of dimethyl carbonate and an aliphatic di- and/or polyhydroxyl compound mixture comprising at least 1,6-hexanediol and 1,5-pentanediol at a temperature of 120° to 280° C. under atmospheric or superatmospheric pressure in the absence of a catalyst while distilling off by-produced methanol, thereby obtaining a preliminary reaction mixture; and (2) heating the preliminary reaction mixture at a temperature of 120° to 280° C. under reduced pressure while distilling off by-produced methanol.
Claim 11
Independent Claim
124 words
A method for preparing a copolycarbonate polyol comprising recurring units respectively of the formulae: ##STR29## and terminal groups, the molar proportion of units (A) to units (B) being in the range of from 9:1 to 1:9, substantially all of said terminal groups being hydroxyl groups, which comprises the steps of: (1) heating a mixture of dimethyl carbonate and an aliphatic di- and/or polyhydroxyl compound mixture comprising at least 1,6-hexanediol and 1,5-pentanediol at a temperature of 120° to 280° C. under atmospheric or superatmospheric pressure in the absence of a catalyst while distilling off by-produced methanol, thereby obtaining a preliminary reaction mixture; and (2) heating the preliminary reaction mixture at a temperature of 120° to 280° C. under reduced pressure while distilling off by-produced methanol.
References Cited (Backward Citations)
US3639354A
Cited
JPS50156599A
Cited
US4013702A
Cited
US4105641A
Cited
US4101529A
Cited
US4103070A
Cited
US4201720A
Cited
US4129715A
Cited
US4362825A
Cited
US4374935A
Cited
JPS60195117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |