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Thermosetting coating composition with improved scratch resistance

A coating composition, the technology of the composition, applied in the direction of coatings, polyester coatings, polyurea/polyurethane coatings, etc., can solve problems such as affecting scratch resistance

Inactive Publication Date: 2021-05-11
EASTMAN CHEM CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increased environmental pressures to reduce VOCs and increase coating solids force formulators to use low molecular weight polymers, which adversely affects scratch resistance

Method used

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  • Thermosetting coating composition with improved scratch resistance
  • Thermosetting coating composition with improved scratch resistance
  • Thermosetting coating composition with improved scratch resistance

Examples

Experimental program
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Effect test

example

[0097] The present invention is illustrated in more detail by the specific examples given below. It should be understood that these examples are illustrative embodiments and are not intended to limit the invention, which should be construed broadly within the scope and content of the appended claims. All parts and percentages in the examples are by weight unless otherwise indicated.

[0098] Preparation of curable polyester

[0099] Example (Table 1) and Control (Table 2) polyester resins were prepared according to the following procedure. All resins were prepared in a two-liter reactor equipped with a heating mantle, mechanical stirrer, thermocouple, nitrogen blanket, oil-heated partial condenser, condensation trap, and water-cooled total condenser.

[0100] Example Polyester 1 (PE1)

[0101] Step 1: Charge HHPA, TMCD, triphenyl phosphite and xylene into a reaction kettle. Fill the condensation trap with additional xylene. The temperature was raised from room temperature...

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PUM

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Abstract

This invention relates to aliphatic, carbamate-functional polyester resins for use in coatings. More particularly this invention relates to aliphatic, carbamate-functional polyester resins containing 2,2,4,4-tetramethyl-1,3- cyclobutanediol (TMCD) that exhibit improved scratch resistance and acid etch resistance when formulated into 2K automotive clearcoats. These carbamate-functional polyesters can be used as the sole resin in the clearcoat binder or in combination with other carbamate-functional acrylic resins and / or hydroxyl-functional acrylic and polyester resins.

Description

technical field [0001] The invention relates to a thermosetting coating composition, which at least includes polyester polyol and a crosslinking agent. Polyester polyols are composed of monomers including 2,4,4-tetraalkylcyclobutane-1,3-diol (TACD) and cycloaliphatic diacids in certain proportions. Coating compositions of the present invention exhibit improved resistance to tree resin compared to control conventional coatings (made from polyester polyols that do not contain TACD or are outside the range of hydroxyl values ​​of those TACD-containing materials). ) and scratch resistance balance. The resin resistance of the coatings of the invention is significantly improved when formulated with the polyesters defined in component A of the formulation of the invention. Background technique [0002] Chemical resistance (especially sunscreen and resin resistance) and scratch resistance remain the most desired improvements in the automotive coating industry's multi-year effort. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/02C09D7/20C09D133/06
CPCC09D167/02C09D133/066C08G18/423C09D175/06C08G18/792C08G18/73C08G18/755C08G18/7621C08G18/7671C08G18/765C08G18/7692C08G63/199C08G63/137C09D167/00C08L67/02C08L33/066C08L67/025C09D7/20
Inventor 周建晖斯泰西·吉姆·马什
Owner EASTMAN CHEM CO