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Rma crosslinkable polymer

A technology of cross-linking polymers and polymers, applied in polyester coatings, coatings, etc., can solve problems such as difficult to achieve

Active Publication Date: 2021-07-23
欧尼克斯荷兰有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, QCT resistance (i.e. wet adhesion) is quite specific and difficult to achieve in coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0131] The following are descriptions of certain embodiments of the invention, given by way of example only.

[0132] Preparation of isosorbide-containing malonate-acetoacetate polyester MIPE1

[0133] MIPE1 was prepared as follows: A round bottom glass reactor equipped with a distillation column filled with Raschig rings was charged with 534.8 g neopentyl glycol (NOP), 393.8 g methylhexahydrophthalic anhydride (HHPA), 41.2 g trimethylol Propane (TMP), 103.6 g isosorbide (IsoS), and 0.44 g butylstannoic acid (BSA). The mixture was placed under a pressure of 100 mbar while purging with a stream of nitrogen for 5 minutes and then brought to atmospheric pressure using nitrogen. This vacuum-nitrogen cycle was repeated three times. Afterwards, the mixture was heated to obtain a stirrable slurry on which three more vacuum-nitrogen cycles were performed. Then, the temperature was raised to a maximum of 240° C., and the monomer mixture was polymerized while distilling off condens...

Embodiment A1-A6 and A9

[0150] Isosorbide-containing malonate and / or acetoacetate functional polyester polymers MIPE1-MIPE7 were used as donor polymers in Real Michael (RMA) coating systems. Under the catalysis of Catalyst C, it is cured using polyfunctional oligomeric acrylate functional acceptor polymer dimethylolpropane tetraacrylate (DiTMPTA). Both the donor and acceptor polymers are characterized by very low acid values ​​(AV 2 Pigments are incorporated into DiTMPTA.

Embodiment A7 and A8

[0152] In addition to the IsoS-containing donor polymer, an IsoS-containing acceptor polymer was additionally used to improve wet adhesion especially on RMA coating formulations (Figure 2). Formulations A7 and A8 are based on MPE1 donor polymer with DiTMPTA (80 wt.%) and 20 wt.% Isosorbide Acrylate 1 (ISA1, Example A7) and Isosorbide Acrylate 2 ( ISA2, the mixture of Example A8) cured. The isosorbide content of ISA1 was 42 wt.%, and the isosorbide content of ISA2 was 56 wt.%.

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Abstract

The invention relates to an RMA crosslinkable polymer comprising: a) at least one RMA Donor moiety X comprising a C-H acidic proton in activated methylene or methine groups, b) at least one moiety Y comprising one or more 5- or 6-membered heterocycles containing an ether-, acetal- or ketal group which in case of two or more of such heterocycles can be fused or linked, wherein the polymer has a weight-average molecular weight Mw of at least 400 g / mol and a C-H equivalent molecular weight CH EQW of at least 80 g / mol. The invention also relates to a process for the preparation of the RMA crosslinkable polymer, to an RMA crosslinkable composition comprising the RMA crosslinkable polymer and coated substrates.

Description

[0001] field of invention [0002] The present invention relates to RMA crosslinkable polymers with improved substrate adhesion and their use in RMA crosslinkable compositions, especially coating compositions, and to RMA crosslinkable polymers comprising RMA crosslinkable polymers. Compositions and coating compositions, methods of applying coatings to substrates and coated substrates prepared by such methods. Background technique [0003] An RMA crosslinkable composition is a composition comprising reactive components A and B each comprising at least 2 reactive groups, wherein the at least 2 reactive groups of component A is an acidic proton (C-H) in an activated methylene or methine (RMA donor group), and at least 2 reactive groups of component B are activated unsaturated groups (C=C) (RMA acceptor body group). These reactive groups react in the presence of a base catalyst (C) to achieve crosslinking by a true Michael addition (RMA) reaction. RMA refers to true Michael add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/123C08G63/42C09D167/00
CPCC08G63/123C08G63/42C09D167/00C08G63/137C08G63/85C09D167/02
Inventor B·A·J·努德多弗N·洛伊B·皮杰J·卡利斯R·克肯
Owner 欧尼克斯荷兰有限公司