Bimodal acrylate PSA for bonding low-energy and rough surfaces

Details Bimodal acrylate PSA for bonding low-energy and rough surfaces Bimodal acrylate PSA for bonding low-energy and rough surfaces

2007-07-25

2010-11-23

Bernshteyn, Michael M (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C526S317100, C526S319000, C526S320000, C525S191000

Reexamination Certificate

active

07838599

ABSTRACT:
A Polyacrylate having an at least bimodal molecular weight distribution is disclosed. The polyacrylate is characterized by at least two maxima in the molar mass distribution curve, at points M1and M2, with M1>M2, in which, viewed formally, there are at least two polymers, P1and P2, each having its own molecular weight distribution, the polymer P1possessing a most frequent molar mass Mmax(P1) and the polymer P2possessing a most frequent molar mass Mmax(P2), where Mmax(P1)>Mmax(P2), at least the polymer P1being based on a monomer mixture comprising at least one monomer type selected from the group of the acrylic esters and of the methacrylic esters of the general formula H2C═CR1—COOR2where R1═H or CH3and where R2represents an aliphatic hydrocarbon chain having 4 to 15 carbon atoms; and at least one olefinically unsaturated monomer type containing functional groups, wherein the functional groups of the at least one olefinically unsaturated monomer type are groups which are able to react for a thermal crosslinking reaction, and at least the polymer P1has copolymerized monomers of the olefinically unsaturated monomer type containing groups that are reactive for a thermal crosslinking reaction, and is capable under the influence of thermal energy, where appropriate with addition of a catalyst, of entering into a crosslinking reaction.

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