US3896069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot melt composition having improved softening temperature
Assignee: Tosoh Corp
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Filing: 1974-05-28
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Granted: 1975-07-22
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Expires: 1994-05-28
Abstract
Abstract A hot melt composition is prepared by employing an ethylenevinyl-acetate copolymer, having a vinylacetate content of 10-45% by weight and melting index of 1 - 1,000 g/10 min., and admixing at least one tackifier, wax, or asphalt and an oxidized low molecular weight polypropylene in a ratio of 1/100 - 60/10 by weight with the ethylene-vinylacetate copolymer.
Inventors
- 👤 Yujiro Kosaka
- 👤 Hitoshi Kuroki
- 👤 Nobuhiro Echida
- 👤 Kanji Otomo
- 👤 Masaru Uemura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:42
CPC Classifications
C; C09; C09J; C09J123/00; C09J123/02; C09J123/04; C09J123/08; C08; C08L; C08L2666/00; C08L2666/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
IN A HOT MELT COMPOSITION WHICH COMPRISES AN THYLENEVINYLACETATE COPOLYMER HAVING A VINYLACETATE CONTENT OF 10 45 WEIGHT PERCENT AND MELTING INDEX OF 1 - 100 G/10 MIN. AND AT LEAST ONE ADDITIVE SELECTED FROM THE GROUP CONSISTING OF A TACKIFIER, WAX AND ASPHALT, THE IMPROVEMENT WHICH COMPRISES: ADMIXING AN OXIDIZED LOW MOLECULAR WEIGHT POLYPROPYLENE HAVING AN ACID VALUE OF 1 - 20, WHICH IS PEPARED BY OXIDIZING POLYPROPYLENE HAVING AN AVERAGE MOLECULAR WEIGHT OF 500 10,000 IN A RATIO OF 1/100 - 60/10 BY WEIGHT WITH SAID ETHYLENE-VINYLACETATE COPOLYMER.
Claim 2
Dependent Claim
90 words
IN A HOT MELT COMPOSITION WHICH COMPRISES AN THYLENEVINYLACETATE COPOLYMER HAVING A VINYLACETATE CONTENT OF 10 45 WEIGHT PERCENT AND MELTING INDEX OF 1 - 100 G/10 MIN. AND AT LEAST ONE ADDITIVE SELECTED FROM THE GROUP CONSISTING OF A TACKIFIER, WAX AND ASPHALT, THE IMPROVEMENT WHICH COMPRISES: ADMIXING AN OXIDIZED LOW MOLECULAR WEIGHT POLYPROPYLENE HAVING AN ACID VALUE OF 1 - 20, WHICH IS PEPARED BY OXIDIZING POLYPROPYLENE HAVING AN AVERAGE MOLECULAR WEIGHT OF 500 10,000 IN A RATIO OF 1/100 - 60/10 BY WEIGHT WITH SAID ETHYLENE-VINYLACETATE COPOLYMER.
Claim 3
Dependent Claim
30 words
The hot melt composition of claim 1, which as a R and B softening temperature of greater than 100*C and a melt viscosity of less than 6000 cps at 160*C.
Claim 4
Dependent Claim
77 words
The hot melt composition of claim 1, wherein 5 - 60 weight percent of the ethylene-vinylacetate copolymer is employed, and at least one additive selected from the group consisting of 10 - 70 weight percent of said tackifier; 1 - 80 weight percent of said wax; and 10 - 90 weight percent of said asphalt; and the oxidized low molecular weight polypropylene are admixed in a ratio of 1/100 - 60/10 by weight with said ethylene-vinylacetate copolymer.
Claim 5
Dependent Claim
18 words
The hot melt composition of claim 1, wherein the tackifier is a rosin, modified rosin or petroleum resin.
Claim 6
Dependent Claim
18 words
The hot melt type composition of claim 1, wherein the wax is a crystalline wax or microcrystalline wax.
Claim 7
Dependent Claim
32 words
The hot melt composition of claim 1, wherein the oxidized low molecular weight polypropylene is an oxidized low molecular weight ethylene-propylene copolymer, wherein the ethylene component is 0 - 20% by weight.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |