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US 2014/0371379 A1Published application
Adhesives made from polymer systems
AssigneesHenkel AG & Co. KGaA, Henkel US IP LLC
InventorsDirk Kasper, Thomas Mueller, Gunter Hoffmann, Knut Hoffmann, Andy Swain, Claudia Yaacoub, Maria Cristina Barbosa DeJesus
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Abstract
The present invention relates to an adhesive, comprising at least one polymer system obtained by a process for reducing the melt viscosity of at least one polymer blend starting material, wherein the process comprises the step of treating at least one polymer blend with at least one radical donor under shear stress at a temperature above the softening point of said polymer blend.
Claims15
An adhesive made by the process of:
- (A) degrading a polymer system with a radical donor until the degraded polymer system has a melt viscosity of less than 50% than the non-degraded polymer at 200° C.;
- and
- (B) adding a tackifier;
- wherein the polymer system consists of (a) 30 to 70 wt % of an elastomeric rubber selected from the group consisting of ethylene-propylene rubber copolymer, ethylene-propylene-diene rubber terpolymer, and mixtures thereof and (b) 30 to 70 wt % a semi-crystalline olefinic polymer or a blend of semi-crystalline olefinic polymers;
- wherein the semi-crystalline olefinic polymer has a heat of melting from 20 to 95 J/g;
- and
- wherein the degraded polymer is present at a level greater than 30 wt %, based on the total weight of the adhesive.
4 more elements
An adhesive made by the process of:
- (A) degrading a polymer system with a radical donor until the degraded polymer system has a melt viscosity of less than 50% than the non-degraded polymer at 200° C.;
- and
- (B) adding a tackifier and a plasticizer;
- wherein the polymer system consists of (a) 30 to 70 wt % of an elastomeric rubber selected from the group consisting of ethylene-propylene rubber copolymer, ethylene-propylene-diene rubber terpolymer, and mixtures thereof and (b) 30 to 70 wt % a semi-crystalline olefinic polymer or a blend of semi-crystalline olefinic polymers;
- wherein the semi-crystalline olefinic polymer has a heat of melting from 20 to 95 J/g;
- wherein the degraded polymer is present at a level greater than 30 wt %, based on the total weight of the adhesive;
- and
- wherein the plasticizer present at a level less than 5 wt %, based on the total weight of the adhesive.
5 more elements
An adhesive made by the process of:
- (A) degrading a polymer system with an azo compound, a diazo compound or a peroxide until the degraded polymer system has a melt viscosity of less than 50% than the non-degraded polymer at 200° C.;
- and
- (B) adding a tackifier and a plasticizer;
- wherein the polymer system consists of (a) 50 to 80 wt % of an elastomeric rubber selected from the group consisting of ethylene-propylene rubber copolymer, ethylene-propylene-diene rubber terpolymer, and mixtures thereof and (b) 20 to 50 wt % a semi-crystalline olefinic polymer or a blend of semi-crystalline olefinic polymers;
- wherein the semi-crystalline olefinic polymer has a heat of melting from 20 to 95 J/g;
- wherein the degraded polymer is present at a level greater than 40 wt %, based on the total weight of the adhesive.
3 more elements
Dependencies are inferred from the claim text.