EP0201715A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Surface-treated polyester film
Assignee: Teijin Ltd
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Filing: 1986-04-07
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Granted: —
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Expires: 2006-04-07
Abstract
Abstract A polyester film having on at least one surface thereof a primer layer comprising a crosslinked product of a polyurethane having at least one functional group selected from a carboxyl group, a sulfo group, a hemisulfate group, and salts of these groups and a polyepoxy compound. The polyester film having a primer layer can be produced by coating an aqueous primer coating composition comprising a polyurethane having at least one of a carboxylic acid salt group, a sulfonic acid salt group and a hemisulfate salt group on at least one surface of a polyester film before its crystallization and orientation are completed, and thereafter completing the cyrstallization and orientation by subjecting the coated film to drying, stretching and heat-treatment, and is useful as a base film for magnetic recording media.
Inventors
- 👤 Teruo Takahashi
- 👤 Hirofumi Yoshikawa
- 👤 Sadayoshi Miura
- 👤 Tamaki Kanai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 03:08
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/0819; C08G18/83; C08G18/831; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C09; C09D; C09D175/00; C09D175/04; G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; G11B5/73931; G11B5/73935; G11B5/74; G11B5/82; G11B5/825; C08J2367/00; C08J2367/02; C08J2475/00; H; H05; H05K; H05K2203/00; H05K2203/12; H05K2203/122; H05K2203/124
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
46 words
A polyester film having on at least one surface thereof a primer layer comprising a crosslinked product of a polyurethane having at least one functional group selected from a carboxyl group, a sulfo group, a hemisulfate group, and salts of these groups and a polyepoxy compound.
Claim 2
Dependent Claim
46 words
A polyester film having on at least one surface thereof a primer layer comprising a crosslinked product of a polyurethane having at least one functional group selected from a carboxyl group, a sulfo group, a hemisulfate group, and salts of these groups and a polyepoxy compound.
Claim 3
Dependent Claim
20 words
The film of claim 1 wherein the polyurethane contains (0.5 -10) x 10-' gram-equivalent/gram of resin of the functional group.
Claim 4
Dependent Claim
21 words
The film of claim 1 wherein the polyurethane has a number average molecular weight in the range of 10,000 to 500,000.
Claim 5
Dependent Claim
30 words
The film of claim 1 wherein the polyurethane is a polyurethane obtained by introducing the functional group into a polyurethane formed from an aliphatic polyester polyol and an aliphatic diisocyanate.
Claim 6
Dependent Claim
12 words
The film of claim 1 wherein the polyurethane has the carboxyl group.
Claim 7
Dependent Claim
15 words
The film of claim 1 wherein the polyepoxy compound is a water-soluble aliphatic polyepoxy compound.
Claim 8
Dependent Claim
20 words
The film of claim 1 wherein the polyepoxy compound has an epoxy equivalent in the range of 100 to 600.
Claim 9
Dependent Claim
17 words
The film of claim 1 wherein the polyepoxy compound is selected from the group consisting of and
Claim 10
Dependent Claim
31 words
The film of claim 1 wherein the crosslinked product is formed by using 1 to 40 parts by weight of the polyepoxy compound per 100 parts by weight of the polyurethane.
Claim 11
Dependent Claim
20 words
The film of claim 1 wherein the primer layer has a blocking force of not more than 30 g/15 cm.
Claim 12
Dependent Claim
46 words
The film of claim 1 wherein the polyester film before application of the primer layer contains fine particles of titanium oxide with an average particle diameter of not more than 0.5 micrometer and has a center line average surface roughness (Ra) of 0.004 to 0.02 micrometer.
Claim 13
Dependent Claim
20 words
The film of claim 1 wherein the primer layer has a thickness in the range of 0.002 to 0.5 micrometer.
Claim 14
Dependent Claim
75 words
A process for producing a polyester film having a primer layer, which comprises coating an aqueous primer coating composition comprising a polyurethane having at least one of a carboxylic acid salt group, a sulfonic acid salt group and a hemisulfate salt group on at least one surface of a polyester film before its crystallization and orientation are completed, and thereafter completing the crystallization and orientation by subjecting the coated film to drying, stretching and heat-treatment.
Claim 15
Dependent Claim
75 words
A process for producing a polyester film having a primer layer, which comprises coating an aqueous primer coating composition comprising a polyurethane having at least one of a carboxylic acid salt group, a sulfonic acid salt group and a hemisulfate salt group on at least one surface of a polyester film before its crystallization and orientation are completed, and thereafter completing the crystallization and orientation by subjecting the coated film to drying, stretching and heat-treatment.
Claim 16
Dependent Claim
22 words
14, The process of claim 13 wherein the polyurethane contains (0.5 -10) x 10- 4 gram-equivalent/gram of resin of the functional group.
Claim 17
Dependent Claim
21 words
The process of claim 13 wherein the polyurethane has a number average molecular weight in the range of 10,000 to 500,000.
Claim 18
Dependent Claim
15 words
The process of claim 13 wherein the polyurethane is a polyurethane obtained by introducing the
Claim 19
Dependent Claim
15 words
functional group into a polyurethane formed from an aliphatic polyester polyol and an aliphatic diisocyanate.
Claim 20
Dependent Claim
15 words
functional group into a polyurethane formed from an aliphatic polyester polyol and an aliphatic diisocyanate.
Claim 21
Dependent Claim
14 words
The process of claim 13 wherein the polyurethane has the carboxylic acid salt group.
Claim 22
Dependent Claim
25 words
The process of claim 17 wherein the carboxylic acid salt group is a group of salt formed between carboxylic acid and an aliphatic tertiary amine.
Claim 23
Dependent Claim
15 words
The process of claim 13 wherein the polyepoxy compound is a water-soluble aliphatic polyepoxy compound.
Claim 24
Dependent Claim
20 words
The process of claim 1 wherein the polyepoxy compound has an epoxy equivalent in the range of 100 to 600.
Claim 25
Dependent Claim
13 words
The process of claim 13 wherein the polyepoxy compound is selected from and
Claim 26
Dependent Claim
29 words
The process of claim 13 wherein the polyepoxy compound is used in an amount of 1 to 40 parts by weight per 100 parts by weight of the polyurethane.
Claim 27
Dependent Claim
16 words
The process of claim 13 wherein the aqueous primer coating composition further comprises a reaction-promoting compound.
Claim 28
Dependent Claim
20 words
The process of claim 23 wherein the reaction-promoting compound is selected from phenolic tertiary amine compounds, imidazole compounds and 1,8-diazo-bicyclo[5,4,O)undecene-7.
Claim 29
Dependent Claim
30 words
The process of claim 24 wherein the reaction-promoting compound is used in an amount of 1 to 60 parts by weight per 100 parts by weight of the polyepoxy compound.
Claim 30
Dependent Claim
42 words
The process of claim 13 wherein the polyester film contains fine particles of titanium oxide having an average particle diameter of not more than 0.5 micrometer and has a center line average surface roughness (Ra) in the range of 0.004 to 0.02.
Claim 31
Dependent Claim
15 words
Use of the film of claim 1 as a base film for magnetic recording media.
Claim 32
Dependent Claim
21 words
A magnetic recording medium comprising the polyester film of claim 1 and a magnetic recording layer formed on its primer layer.
References Cited (Backward Citations)
No citation records indexed.
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