Aerobically curable adhesive

Details Aerobically curable adhesive Aerobically curable adhesive

1997-07-24

2000-08-01

Krass, Frederick

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526110, 526111, 526112, 526213, 526216, 156327, 156332, C09J 400

Patent

active

060968427

DESCRIPTION:

BRIEF SUMMARY
This invention relates to an acrylate- or methacrylate-based aerobically curable adhesive which contains at least one radical-forming initiator and at least one accelerator.


BACKGROUND OF THE INVENTION

Acrylate-based adhesives of the type in question are known. Thus, DE 33 20 918 describes a two-component acrylate adhesive in which the first component consists of the following constituents: urethane/acrylate block resin, hydroxyethyl methacrylate, cumene hydroperoxide, 1-acetyl-2-phenyl hydrazine, benzene sulfimide, acrylic acid and chelator. The second component consists of the following constituents: urethane/acrylate block resin, hydroxyethyl methacrylate, copper octoate and a chelator. The two components are mixed in a ratio by volume of 1:1. A stable bond is formed after 20 seconds. The following comments are made on the transition metal accelerator (page 19, lines 16 et seq.): "Transition metal accelerators are preferably a salt or complex of copper, nickel, cobalt or iron. Preferred examples of these accelerators are copper octoate, copper naphthenate, copper ethyl hexanoate and copper acetyl acetonate and others." The disadvantage of this known adhesive is its pungent odor. In addition, although rapid exothermic polymerization is observed, a surface-tacky polymer is obtained, particularly where the adhesive is present as a thin film with a thickness of 0.1 to 0.2 mm. If the adhesive layer is even thinner, the polymerization is inhibited by oxygen.
Accordingly, the problem addressed by the present invention was to provide an adhesive which would not have these disadvantages, i.e. would be substantially odor-free and would cure so completely that its surface at the boundary with the surrounding air would not be tacky.


BRIEF DESCRIPTION OF THE INVENTION

The solution provided by the invention is defined in the claims and consists essentially in the use of acrylates and/or methacrylates with a boiling temperature of at least 120.degree. C. at normal pressure and also in the use of at least one drying agent or drier.
The adhesive according to the invention is based on acrylates and/or methacrylates, i.e. the reactive component consists predominantly--by weight--of an ester of acrylic acid and/or methacrylic acid. Other reactive components, for example copolymerizable allyl or vinyl compounds, may also be present. Suitable acrylic or methacrylic acid esters are confined to those having a relatively high vapor pressure at room temperature. In very approximate terms, the esters in question are compounds with a boiling point above 120.degree. C. and preferably above 150.degree. C. at normal pressure.
The acrylates or methacrylates may contain one or more reactive double bonds. The alcohol radical may contain hetero atoms, for example in the form of ether, alcohol, carboxylic acid, ester and urethane groups.
One important class of acrylates or methacrylates are the polyurethane (meth)acrylates (PUMA). These may be compounds corresponding to general formula (II): --O--C(.dbd.O)--NH--Q--NH--C(.dbd.O)].sub.2 [{--O--R.sup.4a --O--C(O.dbd.)--NH--Q'--NH--C(O.dbd.)}m--O--R.sup.4a --O--](II) an alkylene oxide containing 4 to 21 carbon atoms, cycloaliphatic groups containing 6 to 18 carbon atoms which are derived from the basic diisocyanate or diisocyanate mixtures and ratio of <10 and a molecular weight in the range from 1,000 to 20,000.
The composition may additionally contain one or more radical-polymerizable compounds (A) and/or (B) corresponding to the following general formula: R.sup.3 (I) or an alkylene oxide containing 4 to 21 carbon atoms and --O--C(.dbd.O)--NH--Q'--NH--C(.dbd.O)}.sub.m --O--R.sup.4 --Ol] R.sup.5 containing 3 to 6 carbon atoms and p=1 to 10 and cycloaliphatic groups containing 6 to 18 carbon atoms derived from diisocyanates or diisocyanate mixtures.
One or more (meth)acrylate comonomers (C) containing no urethane groups may be additionally used. The percentage contents of the reactive compounds A, B and C in the adhesive are as follows: one or more compounds (A) or 100 to 20% by weig

REFERENCES:
patent: 4052244 (1977-10-01), Skoultchi
patent: 4321349 (1982-03-01), Rich
patent: 4439600 (1984-03-01), Moran, Jr.
patent: 5268436 (1993-12-01), Huver et al.
patent: 5354821 (1994-10-01), Huver et al.

Affiliated with

Also associated with

Rating

Aerobically curable adhesive does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Aerobically curable adhesive, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aerobically curable adhesive will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-664884