US4728688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfect binding
Assignee: HB Fuller Adhesives Ltd
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Filing: 1985-04-03
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Granted: 1988-03-01
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Expires: 2005-04-03
Abstract
Abstract In two-short perfect binding of books, excellent results in terms of binding strengths, cold flow and cold crack properties, ink solvent resistance and thermal degradation susceptibility may be achieved using as a first adhesive a water based primer, e.g. a synthetic rubber latex emulsion, and as a second adhesive a hot-melt adhesive comprising a segmented monoalkene-vinyl acetate copolymer, e.g. a segmented ethylene-vinyl acetate copolymer optionally in admixture with at least one other ethylene-vinyl acetate copolymer.
Inventors
- 👤 Richard E. Tizzard
- 👤 George C. Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:31
CPC Classifications
C; C09; C09J; C09J131/00; C09J131/02; C09J131/04; B; B42; B42C; B42C9/00; C09J123/00; C09J123/02; C09J123/04; C09J123/08; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
A two-shot adhesive comprising, separately (a) an aqueous primer emulsion; and (b) an adhesive composition, solid at ambient temperature, having a softening point in the range 65° to 120° C. and comprising (i) at least one segmented ethylene-vinyl acetate (EVA) copolymer, (ii) at least one tackifying resin, (iii) at least one antioxidant, and (iv) at least one other EVA, said segmented EVA constituting from 25 to 50% by weight of the EVA in said adhesive composition.
Claim 2
Dependent Claim
76 words
A two-shot adhesive comprising, separately (a) an aqueous primer emulsion; and (b) an adhesive composition, solid at ambient temperature, having a softening point in the range 65° to 120° C. and comprising (i) at least one segmented ethylene-vinyl acetate (EVA) copolymer, (ii) at least one tackifying resin, (iii) at least one antioxidant, and (iv) at least one other EVA, said segmented EVA constituting from 25 to 50% by weight of the EVA in said adhesive composition.
Claim 3
Dependent Claim
63 words
An adhesive composition, solid at ambient temperatures having a softening point in the range 65° to 120° C. and comprising (i) at least one segmented ethylene-vinyl acetate (EVA) copolymer, (ii) at least one tackifying resin, (iii) at least one antioxidant, and (iv) at least one other EVA, said segmented EVA constituting from 25 to 50% by weight of the EVA in said composition.
Claim 4
Dependent Claim
63 words
An adhesive composition, solid at ambient temperatures having a softening point in the range 65° to 120° C. and comprising (i) at least one segmented ethylene-vinyl acetate (EVA) copolymer, (ii) at least one tackifying resin, (iii) at least one antioxidant, and (iv) at least one other EVA, said segmented EVA constituting from 25 to 50% by weight of the EVA in said composition.
Claim 5
Dependent Claim
25 words
A composition as claimed in claim 2 wherein said EVA and said tackifying resin are present in a weight ratio of from 4:3 to 4:5.
Claim 6
Dependent Claim
17 words
A composition as claimed in claim 2 further comprising at least one colouring agent, diluent or modifier.
Claim 7
Dependent Claim
24 words
A composition as claimed in claim 2 wherein said segmented EVA constitutes from 30 to 40% by weight of the EVA in said composition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |