US4614781A
Expired / Lapsed
US
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Resin from saponified ethylene-vinyl acetate copolymers, production and use thereof
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1984-11-06
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Granted: 1986-09-30
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Expires: 2004-11-06
Abstract
Abstract Disclosed are a colorless and transparent carboxyl-modified resin of saponified ethylene-vinyl acetate copolymers prepared from an ethylene-vinyl acetate copolymer, the 1.0 mm-thick sheet therefrom having a total transmittance of more than 90%, a haze of less than 3% and a yellowness index of 3 and the preparation of the resin. The uses of the resin are also disclosed for laminated glass wherein the resin is used as an interlayer as well as for a solar cell module wherein the resin is used as a sealing material of a semiconductor element.
Inventors
- 👤 Teruo Hori
- 👤 Masamitsu Nakabayashi
- 👤 Yuzo Furukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:01
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02; C08F255/026; B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/1055; B32B17/10788; B32B17/10807; B32B17/10816; B32B17/10825; B32B17/10834; B32B17/10844; B32B17/10853; C08F8/00; C08F8/14
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
36 words
A carboxyl-modified resin of a saponified ethylene-vinyl acetate copolymer, a 1.0 mm-thick sheet therefrom having a total transmittance of more than 90%, a haze of less than 3% and a yellowness index of less than 3.
Claim 2
Dependent Claim
36 words
A carboxyl-modified resin of a saponified ethylene-vinyl acetate copolymer, a 1.0 mm-thick sheet therefrom having a total transmittance of more than 90%, a haze of less than 3% and a yellowness index of less than 3.
Claim 3
Dependent Claim
19 words
A carboxyl-modified resin according to claim 1, the carboxyl-modified resin having an acid value of 0.1 to 100 mgKOH/g.
Claim 4
Dependent Claim
41 words
A carboxyl-modified resin according to claim 1, wherein the base polymer for the saponified copolymer is an ethylene-vinyl acetate copolymer with a vinyl acetate content of 20 to 50 weight % and a melt index of 0.5 to 500 g/10 min.
Claim 5
Dependent Claim
20 words
A carboxyl-modified resin according to claim 1, wherein the saponification degree of the saponified copolymer is about 10 to 80%.
Claim 6
Dependent Claim
27 words
A carboxyl-modified resin according to claim 1, the carboxyl-modified resin being a modification of the saponified ethylene-vinyl acetate copolymer with an unsaturated carboxylic acid or acid anhydride.
Claim 7
Dependent Claim
15 words
A carboxyl-modified resin according to claim 5, wherein the unsaturated carboxylic acid is acrylic acid.
Claim 8
Dependent Claim
40 words
A carboxyl-modified resin according to claim 1, the carboxyl-modified resin having a total transmittance of more than 90%, a haze of less than 2% and a yellowness index of less than 2 in the form of its 1.0 mm-thick sheet.
Claim 9
Dependent Claim
154 words
A process for producing a carboxyl-modified resin of a saponified ethylene-vinyl acetate copolymer, a 1.0 mm-thick sheet from the carboxyl-modified resin having a total transmittance of more than 90%, a haze of less than 3% and a yellowness index of less than 3, which comprises dissolving an ethylene-vinyl acetate copolymer with a vinyl acetate content of about 20 to 50 weight % in an aromatic hydrocarbon having a boiling point of not less than than 50° C., said aromatic hydrocarbon being present in an amount of 150 to 500 parts by weight per 100 parts by weight of the ethylene-vinyl acetate copolymer, saponifying the copolymer with an alkali alcoholate in the solution in the presence of water of 0.1 to 3 moles per mole of the alcoholate, and allowing the saponified product in the reaction solution to react with an unsaturated carboxylic acid or acid anhydride and contacting the said reaction solution with water.
Claim 10
Dependent Claim
154 words
A process for producing a carboxyl-modified resin of a saponified ethylene-vinyl acetate copolymer, a 1.0 mm-thick sheet from the carboxyl-modified resin having a total transmittance of more than 90%, a haze of less than 3% and a yellowness index of less than 3, which comprises dissolving an ethylene-vinyl acetate copolymer with a vinyl acetate content of about 20 to 50 weight % in an aromatic hydrocarbon having a boiling point of not less than than 50° C., said aromatic hydrocarbon being present in an amount of 150 to 500 parts by weight per 100 parts by weight of the ethylene-vinyl acetate copolymer, saponifying the copolymer with an alkali alcoholate in the solution in the presence of water of 0.1 to 3 moles per mole of the alcoholate, and allowing the saponified product in the reaction solution to react with an unsaturated carboxylic acid or acid anhydride and contacting the said reaction solution with water.
Claim 11
Dependent Claim
24 words
A process for producing a carboxyl-modified resin according to claim 8, wherein the saponification is carried out in the presence of a lower alcohol.
Claim 12
Dependent Claim
17 words
A process for producing a caboxyl-modified resin according to claim 9, wherein the lower alcohol is methanol.
Claim 13
Dependent Claim
35 words
A process for producing a carboxyl-modified resin according to claim 9, wherein the lower alcohol is used in the proportion of about 0.1 to 10 moles per mole of vinyl acetate in the ethylene-vinyl acetate.
Claim 14
Dependent Claim
47 words
A process for producing a carboxyl-modified resin according to claim 8, wherein the amount of the alkali alcoholate catalyst to be used in the saponification reaction is at the rate of about 0.01 to 1 mole per mol of vinyl acetate in the starting ethylene-vinyl acetate copolymer.
Claim 15
Dependent Claim
23 words
A process for producing a carboxyl-modified resin according to claim 8, wherein the saponification reaction is carried out at 40° to 60° C.
Claim 16
Dependent Claim
23 words
A process for producing a carboxyl-modified resin according to claim 8, the saponification reaction is terminated by adding water to the reaction system.
Claim 17
Dependent Claim
39 words
A process for producing a carboxyl-modified resin according to claim 8, wherein the modification reaction of the saponified copolymer in the solution with an unsaturated carboxylic acid or acid anhydride is carried out at about 50° to 150° C.
Claim 18
Dependent Claim
37 words
A process for producing a carboxyl-modified resin according to claim 8, wherein the modification reaction of the saponified copolymer in the solution with an unsaturated carboxylic acid is carried out in the presence of a radical-forming substance.
Claim 19
Dependent Claim
46 words
A process for producing a carboxyl-modified resin according to claim 16, wherein prior to the modification reaction, the saponification reaction solution is heated to remove the water used for the saponification reaction and the termination of the reaction and low-boiling by-products formed by the saponification reaction.
Claim 20
Dependent Claim
48 words
A process for producing a carboxyl-modified resin according to claim 8, wherein the contacting of the reaction solution resulting from the acid-modification reaction, with water is carried out by a procedure of pouring water into the reaction solution or a procedure of pouring the reaction solution into water.
Claim 21
Dependent Claim
21 words
A process for producing a carboxyl-modified resin according to claim 18, wherein the contacting is carried out mixing under vigorous stirring.
Claim 22
Dependent Claim
43 words
A process for producing a carboxyl-modified resin according to claim 18, wherein the amount of water for contacting with the reaction solution is 200 to 1000 parts by weight of water against 100 parts by weight of the solid in the reaction solution.
Claim 23
Dependent Claim
20 words
A process for producing a carboxyl-modified resin according to claim 18, wherein the contacting is effected under the heated condition.
Claim 24
Dependent Claim
34 words
A process for producing a carboxyl-modified resin according to claim 18, wherein the reaction solution contacted with water is subjected to the treatment of heating to distill off the solvent to a certain degree.
Claim 25
Dependent Claim
23 words
A process for producing a carboxyl-modified resin according to claim 22, wherein the distillation is carried out in the state of an emulsion.
Claim 26
Dependent Claim
43 words
A process for producing a carboxyl-modified resin according to claim 23, wherein the distillation is carried out by adjusting the amount of a solvent of 10 to 100 parts by weight against 100 parts by weight of the solid in the concentrated solution.
Claim 27
Dependent Claim
37 words
A process for producing a carboxyl-modified resin according to claim 23, wherein the emulsion is cooled to a temperature lower than a melting point of the carboxyl-modified resin, the carboxyl-modified resin separating out in the granular form.
Claim 28
Dependent Claim
149 words
A carboxyl-modified resin of a saponified ethylene-vinyl acetate copolymer, a 1.0 mm-thick sheet therefrom having a total transmittance of more than 90%, a haze of less than 3% and a yellowness index of less than 3, said resin being produced by dissolving an ethylene-vinyl acetate copolymer with a vinyl acetate content of about 20 to 50 weight % in an aromatic hydrocarbon having a boiling point of not less than 50° C., said aromatic hydrocarbon being present in an amount of 150 to 500 parts by weight per 100 parts by weight of the ethylene-vinyl acetate copolymer, saponifying the copolymer with an alkali alcoholate in the solution in the presence of water of 0.1 to 3 moles per mole of the alcoholate, and allowing the saponified product in the reaction solution to react with an unsaturated carboxylic acid or acid anhydride and contacting the said reaction solution with water.
Claim 29
Dependent Claim
149 words
A carboxyl-modified resin of a saponified ethylene-vinyl acetate copolymer, a 1.0 mm-thick sheet therefrom having a total transmittance of more than 90%, a haze of less than 3% and a yellowness index of less than 3, said resin being produced by dissolving an ethylene-vinyl acetate copolymer with a vinyl acetate content of about 20 to 50 weight % in an aromatic hydrocarbon having a boiling point of not less than 50° C., said aromatic hydrocarbon being present in an amount of 150 to 500 parts by weight per 100 parts by weight of the ethylene-vinyl acetate copolymer, saponifying the copolymer with an alkali alcoholate in the solution in the presence of water of 0.1 to 3 moles per mole of the alcoholate, and allowing the saponified product in the reaction solution to react with an unsaturated carboxylic acid or acid anhydride and contacting the said reaction solution with water.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |