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US4168253A
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Extending the molten stability of poly(ethylene-vinyl acetate) hot-melt adhesives
Assignee: Union Camp Corp
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Filing: 1978-01-25
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Granted: 1979-09-18
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Expires: 1998-01-25
Abstract
Abstract The disclosure is of a method for extending the molten stability of ethylene-vinyl acetate (EVAc) copolymers. One embodiment of the method comprises mixing a lithium salt in the adhesive compositions. The disclosure is also of EVAc-based hot-melt adhesive compositions prepared by the method of the invention and characterized in part by their stability in the molten state.
Inventors
- 👤 Samuel D. Hollis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:47
CPC Classifications
C; C09; C09J; C09J123/00; C09J123/02; C09J123/04; C09J123/08; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C09J131/00; C09J131/02; C09J131/04; C08L; C08L2666/00; C08L2666/28; C08L2666/34; C09J2301/00; C09J2301/30; C09J2301/304; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
48 words
A method of increasing the molten stability of rosin ester tackified, ethylene-vinyl acetate copolymer based, hot-melt adhesive compositions, which comprises; mixing with said compositions soluble lithium metal ion in a proportion the equivalent of from 0.01 to 5.0 percent by weight of the lithium metal of said compositions.
Claim 2
Independent Claim
48 words
A method of increasing the molten stability of rosin ester tackified, ethylene-vinyl acetate copolymer based, hot-melt adhesive compositions, which comprises; mixing with said compositions soluble lithium metal ion in a proportion the equivalent of from 0.01 to 5.0 percent by weight of the lithium metal of said compositions.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein said lithium metal ion is provided in a lithium compound which is a salt of an organic acid.
Claim 4
Dependent Claim
32 words
The method of claim 2 wherein the lithium compound is a reactive form of lithium such that it will form lithium salts with the organic acids already present in the adhesive composition.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein said lithium metal ion is provided in a rosin tackifier resin salt of lithium.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein said ion is derived from lithium hydroxide.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein said ion is derived from lithium acetate.
Claim 8
Dependent Claim
43 words
A hot-melt adhesive composition, which comprises; an ethylene-vinyl acetate copolymer base, a rosin or rosin derivative tackifier, an antioxidant and lithium metal ion in a proportion the equivalent of from 0.01 to 5.0 percent by weight of the lithium metal of said composition.
Claim 9
Dependent Claim
43 words
A hot-melt adhesive composition, which comprises; an ethylene-vinyl acetate copolymer base, a rosin or rosin derivative tackifier, an antioxidant and lithium metal ion in a proportion the equivalent of from 0.01 to 5.0 percent by weight of the lithium metal of said composition.
Claim 10
Dependent Claim
18 words
The adhesive of claim 7 wherein said tackifier is the condensation product of tall oil rosin and pentaerythritol.
References Cited (Backward Citations)
US3560420A
Cited
US3657171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-17 | 1983-03-19 | 1983-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-17 | 1987-03-19 | 1987-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-17 | 1991-03-19 | 1991-09-18 | $7700.00 | Window Closed / Lapsed |