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EP0052927A2
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Stretched film structure of the poly-1,3-phenylene terephthalate type
Assignee: Mitsui Chemicals Inc
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Filing: 1981-10-08
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Granted: —
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Expires: 2001-10-08
Abstract
Abstract A monoaxially or biaxially stretched film structure, or a heat-set structure thereof, of an unstretched film of an aromatic polyester having an intrinsic viscosity, determined in p-chlorophenol at 50°C, of 0.4 to 2.0 and composed of [A] polybasic carboxylic acid component units consisting of terephthalic acid units (a 1 ) and units (a 2 ) of a polybasic carboxylic acid otherthan terephthalic acid, the proportion of the units (a 2 ) being up to 25 mole% based on the units (a,) and units (a 2 ) combined, and [B] polyol component units consisting of resorcinol units (b 1 ) and units (b 2 ) of a polyol other than resorcinol, the proportion of the units (b 2 ) being up to 25 mole% based on the units (b 1 ) and (b 2 ) combined.
Inventors
- 👤 Tadao Yatsu
- 👤 Akira Todo
- 👤 Toshiki Sotoyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 20:38
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/20; C08G63/60; C08G63/68; C08G63/688; C08G63/6884; C08G63/6886; C08J2367/00; C08J2367/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
153 words
A film structure of an aromatic polyester of the poly-1,3-phenylene terephthalate type, characterised by being a monoaxially or biaxially stretched film structure, or a heat-set structure thereof, of an unstretched film of an aromatic polyester having an intrinsic viscosity, determined in p-chlorophenol at 50°C, of 0.4 to 2.0 and composed of [A] polybasic carboxylic acid component units consisting of terephthalic acid units (a l ) and units (a 2 ) of a polybasic carboxylic acid other than terephthalic acid, the proportion of the units (a 2 ) being up to 25 mole% based on the units (a l ) and units (a 2 ) combined, and [B] polyol component units consisting of resorcinol units (b l ) and units (b 2 ) of a polyol other than resorcinol, the proportion of the units (b 2 ) being up to 25 mole% based on the units (b l ) and (b 2 ) combined.
Claim 2
Dependent Claim
153 words
A film structure of an aromatic polyester of the poly-1,3-phenylene terephthalate type, characterised by being a monoaxially or biaxially stretched film structure, or a heat-set structure thereof, of an unstretched film of an aromatic polyester having an intrinsic viscosity, determined in p-chlorophenol at 50°C, of 0.4 to 2.0 and composed of [A] polybasic carboxylic acid component units consisting of terephthalic acid units (a l ) and units (a 2 ) of a polybasic carboxylic acid other than terephthalic acid, the proportion of the units (a 2 ) being up to 25 mole% based on the units (a l ) and units (a 2 ) combined, and [B] polyol component units consisting of resorcinol units (b l ) and units (b 2 ) of a polyol other than resorcinol, the proportion of the units (b 2 ) being up to 25 mole% based on the units (b l ) and (b 2 ) combined.
Claim 3
Dependent Claim
15 words
A film structure according to claim 1 which has a crystallinity of 15 to 55%.
Claim 4
Dependent Claim
35 words
A film structure according to claim 1 or 2 wherein the proportion of units (a 2 ) is up to 20 mole%, and the proportion of units (b 2 ) is up to 20 mole%.
Claim 5
Dependent Claim
69 words
A film structure according to claim 1, 2 or 3 wherein the units ( a2 ) consist of units (a 2 -1) of a dibasic carboxylic acid other than terephthalic acid and units (a 2 -2) of a tribasic or higher carboxylic acid, and the proportion of the units (a 2 -2) is 0.01 to 5 mole% based on the units (a l ) and (a 2 ) combined.
Claim 6
Dependent Claim
67 words
A film structure according to any one of claims 1 to 4 wherein the units (b 2 ) consist of units (b 2 -1) of a diol other than resorcinol and units (b 2 -2) of a trihydric or higher polyol, and the proportion of the units (b 2 -2) is 0.01 to 5 mole% based on the units (b l ) and (b 2 ) combined.
References Cited (Backward Citations)
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