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A rma crosslinkable composition with improved adhesion

a crosslinkable composition and composition technology, applied in the field of rma crosslinkable compositions, can solve the problems of loss of substrate adhesion promoting ability, unstable alkoxysilane adhesion promotors, and inability to stabilize alkoxysilane in basic or acidic aqueous media, etc., to achieve the effect of improving the open tim

Inactive Publication Date: 2018-06-14
ALLNEX NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a special catalyst that is used in a two-part RMA crosslinkable coating composition. The catalyst decomposes in a coating layer to generate carbon dioxide and a strong base, which starts the crosslinking reaction. The coating is highly reactive and cures quickly, and is perfect for applications where fast and efficient cure is important. The patent also mentions an adhesion promotion pre-mix that can be used to improve the adhesion of paints on substrates. This pre-mix includes an alkoxysilane adhesion promoter and a catalyst. The resulting formulation has a long pot-life and reacts quickly when applied. The patent also mentions the use of a reactivity moderator to improve the open time of the coating composition. Overall, the patent describes a special catalyst and a stable formulation for improving adhesion and efficiency in RMA crosslinkable coatings.

Problems solved by technology

It was found that the stability problem with alkoxysilane adhesion promotors is present in particular when water or pigments or both are present.
It is believed that the siloxy groups may react with water or the pigment surface, thus losing their substrate adhesion promoting abilities.
Also, these alkoxysilanes are not stable in basic or acidic aqueous media.
Therefore it appears that alkoxysilanes tend to lose adhesion performance over time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 12

[0100]Thinner 1 was aged for 1 month at 40° C. 33.25 grams of Catalyst 1 and 70 grams of aged Thinner 1 were subsequently added to 936 grams of Paint A. This mixture was sprayed on a Gardobond 26S / 60 / OC panel (a Zinc phosphated steel substrate) with a dry layer thickness of 120 μm. After 1 day at room temperature and 1 hour at 60° C., adhesion was determined to be very good. The adhesion was tested using the cross-cut adhesion test as described in ASTM D3359.

example 13

[0101]The same composition as in Example 12 was sprayed on an electroplated zinc steel panel with a dry layer thickness of 65 μm. After 1 day at room temperature, adhesion was determined to be very good.

example 14

[0102]Example 13 was repeated except that aged Thinner 2 was used (1 month at 40° C.). Adhesion was determined to be very good.

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Abstract

The invention relates generally to RMA crosslinkable compositions, in particular coating compositions, more in particular pigmented coating compositions (paints) with improved adhesion to substrates. The invention further relates to an adhesion promotor for improving adhesion on a substrate surface of an RMA crosslinkable composition, a method for applying a RMA cross-linked coating layer with improved adhesion and a kit of parts and premixes for use in said method.

Description

[0001]The invention relates generally to RMA crosslinkable compositions, in particular coating compositions, more in particular pigmented coating compositions (paints) with improved adhesion to substrates. The invention further relates to an adhesion promotor for improving adhesion on a substrate surface of an RMA crosslinkable composition, a method for applying a RMA crosslinked coating layer with improved adhesion and a kit of parts and premixes for use in said method.[0002]RMA crosslinkable compositions are compositions comprising at least one crosslinkable component comprising reactive components A and B each comprising at least 2 reactive groups wherein the at least 2 reactive groups of component A are acidic protons (C—H) in activated methylene or methine groups (RMA donor group), and the at least 2 reactive groups of component B are activated unsaturated groups (C═C) (RMA acceptor group). These reactive groups react to achieve crosslinking by Real Michael Addition (RMA) react...

Claims

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Application Information

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IPC IPC(8): C09D167/02C08L67/02C08J3/24C09D17/00C08L63/00C09D163/00B05D1/02
CPCC09D167/02C08L67/02C08J3/24C09D17/008C08L63/00C09D163/00B05D1/02C08J2367/02C08L2205/025C08G61/12C08G2261/334C08G2261/135B05D3/0254B05D3/102
Inventor GOEDEGEBUURE, RIENTHYS, FERRY LUDOVICUSDE WOLF, ELWIN ALOYSIUS CORNELIUS ADRIANUSBRINKHUIS, RICHARD HENDRIKUS GERRITGESSNER, MICHAEL ANTHONYBUSER, ANTONIUS JOHANNES WILHELMUS
Owner ALLNEX NETHERLANDS BV