Propylene copolymers for adhesive applications
First Claim
1. An adhesive comprising a copolymer comprising at least 80 wt % of units derived from propylene and from about 1 to about 20 wt % of units derived from at least one C6 to C10 alpha-olefin, wherein the copolymer has a molecular weight of less than 100,000 and a heat of fusion between about 10 and about 70 J/g and wherein the adhesive has the following properties:
- (a) at least 50% fiber tear at −
18°
C. using Inland paper board as a substrate;
(c) at least 50% fiber tear at 25°
C. using Inland paper board as a substrate;
(d) a viscosity of less than 50,000 mPa sec at 190°
C.;
(e) a set time of less than 4 seconds; and
(f) a toughness of at least 3.4 megajoule/m3.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed herein are adhesives comprising a copolymer comprising at least 80 wt % of units derived from propylene and from about 1 to about 20 wt % of units derived from at least one C6 to C10 alpha-olefin. The copolymer has a molecular weight of less than 100,000 and a heat of fusion between about 10 and about 70 J/g. An adhesive containing the copolymer preferably exhibits at least 50% fiber tear at −18° C. and at least 50% fiber tear at +25° C. using Inland paper board as a substrate; a viscosity of less than 50,000 mPa sec at 190° C., a set time of less than 4 seconds and a toughness of at least 3.4 megajoule/m3.
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Citations
29 Claims
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1. An adhesive comprising a copolymer comprising at least 80 wt % of units derived from propylene and from about 1 to about 20 wt % of units derived from at least one C6 to C10 alpha-olefin, wherein the copolymer has a molecular weight of less than 100,000 and a heat of fusion between about 10 and about 70 J/g and wherein the adhesive has the following properties:
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(a) at least 50% fiber tear at −
18°
C. using Inland paper board as a substrate;(c) at least 50% fiber tear at 25°
C. using Inland paper board as a substrate;(d) a viscosity of less than 50,000 mPa sec at 190°
C.;(e) a set time of less than 4 seconds; and (f) a toughness of at least 3.4 megajoule/m3. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An adhesive comprising a copolymer comprising at least 80 wt % of units derived from propylene and from about 1 to about 20 wt % of units derived from at least one C6 to C10 alpha-olefin, wherein the copolymer has a molecular weight of less than 50,000 and a heat of fusion between about 10 and about 70 J/g and wherein the adhesive has a Dot T-Peel adhesion of 8 newton or more for adhesion between a fiber board and a fabric substrate at room temperature (25°
- C.) and a Dot T-Peel adhesion of 8 newton or more for adhesion between two polyethylene terephthalate (PET) films at room temperature (25°
C.) and at 40°
C.
- C.) and a Dot T-Peel adhesion of 8 newton or more for adhesion between two polyethylene terephthalate (PET) films at room temperature (25°
Specification