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Dual cure adhesive formulations

a technology of adhesive formulation and cure time, applied in the field of adhesives, can solve the problems of increasing the cost of cleaning, rising to unique requirements not easily met by previously available adhesives,

Inactive Publication Date: 2008-01-31
LORD CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0027]c) allowing the adhesive to develop partial or full strength by the ambient temperature radical catalyst system; and,

Problems solved by technology

However, these applications give rise to unique requirements not easily met by previously available adhesives.
Such uncured adhesive can be transferred to other parts of the assembly or to the application equipment resulting in increasing clean-up costs.

Method used

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  • Dual cure adhesive formulations
  • Dual cure adhesive formulations
  • Dual cure adhesive formulations

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0095]The following masterbatch was prepared:

[0096]A-side

Raw MaterialDescriptionAmount (wt. %)Monomer 133.79Monomer 22.4Tertiary amine1.4initiatorPhotoinitiatorX % (see below)Adhesion promoter3.0Rheology modifier5.4Stabilizer0.01Rubber toughener34.5Filler16.3Wax1.2Total~100.0

[0097]B-side

Raw MaterialDescriptionAmount (wt. %)Epoxy resin50.7Benzoyl peroxide7.7(BPO) sourceRheology modifier1.0Filler40.6Total100.0

[0098]This adhesive was mixed in a 4:1 ratio by volume and dispensed in a bead configuration (¼″ wide×⅛″ thick×3″ long) onto an aluminum substrate and passed through a UV cure unit at various energy levels. Samples were observed for a tack-free surface immediately after exposure to UV radiation and 24 hours after exposure. Photoinitiator levels given in the following table are a percentage of the adhesive after the two sides A and B were mixed.

PI levelUV energyPhotoinitiator(wt %)(mJ / cm2)Initial tack24 hr. tackNone (control)0723tackytacky1012tackytackyPhotoinitiator2.0701tack fre...

example 2

[0099]A bead of the above masterbatch with 1 percent Photoinitiator B added to the A-side was applied to a substrate and was cured for 24 hours at ambient temperature. The cured adhesive, which had a thin film of uncured adhesive at the surface, was exposed to 600 mj / cm2 of UV radiation. The surface was rendered tack-free. The sample was then painted. After the paint had completely cured, a crosshatch adhesion test was performed according to ASTM F 1842-02, and the resulting adhesion was excellent.

example 3

[0100]The following photoinitiators were added at 2 and 4-weight percent to the A-side of the above masterbatch and were mixed thoroughly.[0101]1. No Photoinitiator[0102]2. Photoinitiator C (blend of 2-isopropyl and 4-isopropyl thioxanthone)[0103]3. Photoinitiator D (2,4,6-Trimethylbenzoyldiphenylphosphine oxide)

[0104]Each of these materials was mixed at 4:1 by volume with the above masterbatch B-Side and dispended into a 0.25″ wide bead and allowed to cure at ambient temperature for 60 minutes. After cure, the surfaces of all samples were tacky. All samples were then exposed to UV light at an intensity of 2000 mJ / cm2. The surfaces of both samples of #2 and #3 were tack-free, while the surface of #1 remained tacky.

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Abstract

An adhesive composition comprising as principal components, a polymerizable component, an ambient temperature radical polymerization catalyst system and a photoinitiator. The adhesive may optionally comprise an adhesion promoter, a toughener, an epoxy, and a filler material. Further, a two-part reactive adhesive comprising, a first part comprising, (i) at least one free radical-polymerizable monomer, (ii) at least one reducing agent, and (iii) a photoinitiator, and a second part comprising an oxidizing agent that is reactive at ambient temperature with the reducing agent to produce free radicals that are capable of initiating and propagating free radical polymerization.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of, and incorporates by reference, U.S. Provisional Patent Application No. 60 / 820,680, filed Jul. 28, 2006 entitled “DUAL CURE ADHESIVE FORMULATIONS”, and U.S. Provisional Patent Application No. 60 / 870,143, filed Dec. 15, 2006 also entitled “DUAL CURE ADHESIVE FORMULATIONS”.FIELD OF THE INVENTION[0002]The present invention relates to adhesives containing an ambient-temperature cure system and a photoinitiator. The adhesive is cured by activation of the ambient temperature cure system, and activating the photoinitiator to cure surface portions of the adhesive.BACKGROUND OF THE INVENTION[0003]Redox-activated acrylic structural adhesives are well known articles of commerce which are used commercially for bonding metal to metal, and for cross bonding two dissimilar substrates materials. Acrylic structural adhesives have found growing use in the automotive industry where the adhesive bonding of metal parts i...

Claims

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Application Information

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IPC IPC(8): B29C65/54C08L101/02
CPCB29C35/0805Y10T428/2857B29C65/1406B29C65/1409B29C65/1416B29C65/4845B29C2035/0822B29C2035/0827B29C2035/0855B29K2101/12C08F2/50C08F4/40C08K5/07C08K5/5397C09J5/00C09J11/00C09J2433/00B29C65/485B29C65/4865B29C65/483Y10T428/2419Y10T428/2809Y10T156/1002Y10T428/28Y10T428/24256Y10T428/2804Y10T156/1028Y10T428/287Y10T156/1036Y10T156/103B29C65/1403C08F20/18C09J5/10C09J133/10
Inventor PRESSLEY, MARK W.
Owner LORD CORP
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