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Polyolefin adhesive compositions
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A technology of adhesives and polyolefins, which is applied in the field of polyolefin adhesive compositions, and can solve problems such as long curing time
Inactive Publication Date: 2015-03-25
EXXONMOBIL CHEM PAT INC
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However, when adhesives are formulated with these higher molecular weight waxes, cure times are longer
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[0175] 1. An adhesive comprising a polyolefin base polymer and 1-15 wt% of at least two wax components, based on the total weight of the polyolefin base polymer and the at least two wax components, wherein the at least two The wax component comprises a first wax component and a second wax component, wherein the second wax component has a weight average molecular weight (Mw 蜡2 ) than the weight average molecular weight (Mw) of the first wax component 蜡1 ) is at least 1000 g / mol.
[0176] 2. The adhesive of embodiment 1, wherein the adhesive has the following properties:
[0177] (a) at least 50% fiber tear at 25°C using Inland paperboard as the substrate; and
[0178] (c) A curing time of less than 3 seconds.
[0179] 3. The adhesive of any one of embodiments 1 or 2, further comprising 1 to 10 wt% of at least one functionalized polyolefin.
[0180] 4. The adhesive of embodiment 3, wherein the functionalized polyolefin comprises 1-6 wt% of the adhesive.
[0181] 5. The adhe...
Embodiment
[0214] All propylene copolymers used in the hot melt adhesive composition examples were prepared using the following procedure. Polymerization was carried out in a liquid filled single stage continuous reactor using a mixed metallocene catalyst system. The reactor was a 0.5 liter stainless steel autoclave reactor and was equipped with a stirrer, water cooling / steam heating element with temperature controller and pressure controller. Solvent, propylene and comonomers (such as 1-hexene and 1-octene) were first purified by passing through a three-column purification system. The purification system consisted of an Oxiclear column (model #RGP-R1-500 from Labclear) followed by 5A and 3A molecular sieve columns. The purification column was regenerated periodically whenever there was evidence of reduced polymerization activity. Both 3A and 5A molecular sieve columns were regenerated in-house under nitrogen at set temperatures of 260°C and 315°C, respectively. The molecular sieve ma...
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Abstract
An adhesive and method for hot melt application. The adhesive comprises polyolefin base polymer, from 1 to 10 wt % of at least one functionalized polyolefin, and from 1 to 15 wt % of a wax, based on the total weight of the polyolefin base polymer, functionalized polyolefin and wax, wherein the wax has a weight average molecular weight at least 8% of the weight average molecular weight of the polyolefin base polymer, viscosity at 190° C. of 60 mPa·s or more, and a crystallization temperature greater than the polyolefin base polymer and greater than 100° C., and wherein the adhesive has at least 5% fiber tear at 2° C., at least 50% fiber tear at 25° C., and a characteristic set time of less than 3 seconds.
Description
[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Application No. 12 / 634,222, filed December 9, 2009, which is a continuation-in-part of U.S. Application No. 12 / 616,637, filed November 11, 2009, which was filed in 2009 Continuation-in-Part of U.S. Application No. 12 / 472,022, filed May 26, which claims priority to U.S. Application No. 61 / 060,014, filed June 9, 2008, and relates to U.S. Application No. 15, 2002 No. 60 / 418,482, U.S. Application No. 60 / 460,714 filed April 4, 2003, 10 / 687,508 issued as U.S. Patent No. 7,294,681, 10 / 686,951 issued as U.S. Patent No. 7,524,910, issued as U.S. Patent No. 7,223,822 10 / 825,380, 10 / 825,635 issued as U.S. Patent No. 7,541,402, 10 / 825,349 issued as U.S. Patent No. 7,550,528, 10 / 825,348 filed April 15, 2004, 11 / 825, filed September 29, 2006 529,839 and 11 / 541,185, filed September 29, 2006, each of which is incorporated herein by reference in its entirety. technical field [0003] This invent...
Claims
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