US4376845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-component polymer blends and adhesive films prepared therefrom
Assignee: Dow Chemical Co
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Filing: 1980-12-12
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Granted: 1983-03-15
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Expires: 2000-12-12
Abstract
Abstract Polymer blends are provided which are characterized by good processability on conventional extrusion equipment to provide films having excellent adhesion to various substrates while still exhibiting good non-blocking properties during film manufacture, storage, shipment and use. Such blends comprise, based upon the total blend weight, from 5 to about 90 weight percent of a high melt index adhesive resin; from about 5 to about 90 weight percent of a relatively low melt index adhesive resin; and from about 5 to about 70 weight percent of non-adhesive resin having a melt index of from about 3 to about 10.
Inventors
- 👤 Bruce A. Metzger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:39
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/10; B; B32; B32B; B32B27/00; B32B27/04; B32B5/00; B32B5/02; B32B5/022; B32B5/18; B32B5/22; B32B5/24; B32B5/245; B32B7/00; B32B7/04; B32B7/12; C09J123/00; C09J123/02; C09J123/04; B32B2262/00; B32B2262/02; B32B2262/0261; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2305/00; B32B2305/10; B32B2305/18; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/04
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
174 words
A normally solid thermoplastic polymer blend composition comprising, based upon the total weight of said composition, (a) from about 5 to 90 weight percent of a first adhesive resin having a melt index of from about 50 to about 700 and comprising a random copolymer of a major proportion by weight of ethylene and a minor proportion by weight of an ethylenically unsaturated carboxylic acid; (b) from about 5 to about 90 weight percent of a normally solid second adhesive resin having a melt index of from about 3 to about 15 and comprising a random copolymer of a major proportion by weight of ethylene with a minor proportion by weight of an ethylenically unsaturated carboxylic acid; and (c) from about 5 to about 70 weight percent of a normally solid non-adhesive resin having a melt index of from about 3 to about 10 and comprising a homopolymer of ethylene or a copolymer of a major proportion by weight of ethylene and a minor proportion by weight of a C 4 -C 12 α-olefin.
Claim 2
Dependent Claim
174 words
A normally solid thermoplastic polymer blend composition comprising, based upon the total weight of said composition, (a) from about 5 to 90 weight percent of a first adhesive resin having a melt index of from about 50 to about 700 and comprising a random copolymer of a major proportion by weight of ethylene and a minor proportion by weight of an ethylenically unsaturated carboxylic acid; (b) from about 5 to about 90 weight percent of a normally solid second adhesive resin having a melt index of from about 3 to about 15 and comprising a random copolymer of a major proportion by weight of ethylene with a minor proportion by weight of an ethylenically unsaturated carboxylic acid; and (c) from about 5 to about 70 weight percent of a normally solid non-adhesive resin having a melt index of from about 3 to about 10 and comprising a homopolymer of ethylene or a copolymer of a major proportion by weight of ethylene and a minor proportion by weight of a C 4 -C 12 α-olefin.
Claim 3
Dependent Claim
23 words
The polymer blend of claim 1, wherein the first adhesive resin constitutes from about 15 to about 75 weight percent of said blend.
Claim 4
Dependent Claim
23 words
The polymer blend of claim 1, wherein the first adhesive resin constitutes from about 20 to about 60 weight percent of said blend.
Claim 5
Dependent Claim
23 words
The polymer blend of claim 1, wherein the second adhesive resin constitutes from about 10 to about 70 weight percent of said blend.
Claim 6
Dependent Claim
22 words
The polymer blend of claim 1, wherein the non-adhesive resin constitutes from about 10 to about 60 weight percent of said blend.
Claim 7
Dependent Claim
41 words
The polymer blend of claim 1, wherein the first adhesive resin is a random ethylene copolymer having from about 15 to about 25 weight percent, based upon the weight of said copolymer, of an ethylenically unsaturated carboxylic acid monomer copolymerized therein.
Claim 8
Dependent Claim
41 words
The polymer blend of claim 1, wherein the second adhesive resin is a random ethylene copolymer having from about 2 to about 12 weight percent, based upon the weight of said copolymer, of an ethylenically unsaturated carboxylic acid monomer copolymerized therein.
Claim 9
Dependent Claim
37 words
The polymer blend of claim 1, wherein the non-adhesive resin is a low density polyethylene having a density of from about 0.910 to about 0.930 and a melting point of from about 100° to about 120° C.
Claim 10
Dependent Claim
69 words
The polymer blend of claim 1, wherein the first adhesive resin (a) is a random ethylene copolymer having from about 15 to about 25 weight percent, based upon the weight of said copolymer, of an ethylenically unsaturated carbocylic acid monomer copolymerized therein; (b) has melt index of from about 200 to about 400; and (c) constitutes from about 20 to about 60 weight percent of the total polymer blend.
Claim 11
Dependent Claim
63 words
The polymer blend of claim 9, wherein the second adhesive resin (a) is a random ethylene copolymer having from about 2 to about 12 weight percent of an ethylenically unsaturated carboxylic acid monomer copolymerized therein; (b) has a melt index of from about 3 to about 10; and (c) constitutes from about 10 to about 70 weight percent of the total polymer blend.
Claim 12
Dependent Claim
53 words
The polymer blend of claim 10, wherein the non-adhesive resin (a) is a low density polyethylene having a density of from about 0.910 to about 0.930; (b) has a melting point of from 110° to 115° C.; and (c) constitutes from about 10 to about 60 weight percent of the total polymer blend.
Claim 13
Dependent Claim
17 words
A thermoplastic polymer film composed essentially of a thin sheet of the polymer blend of claim 11.
Claim 14
Dependent Claim
21 words
The thermoplastic polymer film of claim 12, wherein said film has a thickness of from about 0.5 to about 15 mils.
Claim 15
Dependent Claim
17 words
A thermoplastic polymer film composed essentially of a thin sheet of the polymer blend of claim 1.
Claim 16
Dependent Claim
21 words
The thermoplastic polymer film of claim 14, wherein said film has a thickness of from about 0.5 to about 15 mils.
Claim 17
Dependent Claim
63 words
The polymer blend of claim 1 wherein the first adhesive resin is a random copolymer derived from the addition polymerization of from about 50 to about 85 weight percent of ethylene, from about 15 to about 25 weight percent of an ethylenically unsaturated carboxylic acid and from 0 to about 25 weight percent of a lower alkyl or hydroxyalkyl ester of acrylic acid.
Claim 18
Dependent Claim
64 words
The polymer blend of claim 1 wherein the second adhesive resin is a random copolymer derived from the addition polymerization of from about 50 to about 98 weight percent of ethylene, from about 2 to about 12 weight percent of an ethylenically unsaturated carboxylic acid copolymer and from 0 to about 40 weight percent of a lower alkyl or hydroxyalkyl ester of acrylic acid.
Claim 19
Dependent Claim
27 words
The polymer blend of claim 1 wherein at least a portion of the carboxylic acid groups of the first adhesive resin are in neutralized metallic salt form.
Claim 20
Dependent Claim
15 words
The polymer blend of claim 1 wherein the second adhesive resin is an ionomer resin.
Claim 21
Dependent Claim
22 words
The polymer blend of claim 1 wherein the first adhesive resin has a melt index of from about 200 to about 400.
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) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |