Coating composition

Patent metadata

Field	Value
Publication number	US-2021002510-A1
Application number	US-201916968733-A
Country	US
Kind code	A1
Filing date	Feb 8, 2019
Priority date	Feb 11, 2018
Publication date	Jan 7, 2021
Grant date	—

Abstract

The present invention relates to a coating composition and a method for preparing the same, a coating method and use thereof as well as a product coated with the coating composition. The coating composition comprises: A) a hydroxyl-containing component consisting of: a) a polyester-modified polycarbonate polyol having a number-average molecular weight of 500-6000 g/mol, the amount of which is greater than 50 wt. % based on that the weight of the hydroxyl-containing component is 100 wt. %, b) an optional polyester polyol having a hydroxyl content of not less than 10 wt. % as measured in accordance with DIN EN ISO 4629-2, and c) an optional polyacrylate polyol; and B) a polyisocyanate; wherein the equivalent ratio of isocyanate groups to hydroxyl groups of the composition is 0.5-1.2. A coating formed from the coating composition provided by the present invention has good appearance and adhesion as well as good reflowing, and especially can rapidly reflow at normal temperature.

First claim

1 .- 20 . (canceled)

21 . A coating composition comprising:
A) a hydroxyl-containing component consisting of:
a) a polyester-modified polycarbonate polyol having a number-average molecular weight (determined by gel permeation chromatography (GPC) in accordance with DIN 55672-1:2016-03 using polystyrene as standard and tetrahydrofuran as eluent) of 500-6000 g/mol, the amount of which is greater than 50 wt. % based on that the weight of the hydroxyl-containing component is 100 wt. %,
b) optionally a polyester polyol having a hydroxyl content of not less than 10 wt. % as measured in accordance with DIN EN ISO 4629-2, and
c) optionally a polyacrylate polyol; and
B) a polyisocyanate; the equivalent ratio of isocyanate groups to hydroxyl groups of the composition being 0.5-1.2.

22 . The composition according to claim 21 , wherein the polyester-modified polycarbonate polyol is a polyester-modified aliphatic polycarbonate polyol.

23 . The composition according to claim 21 , wherein the polyester-modified polycarbonate polyol has a number-average molecular weight of 650-4000 g/mol.

24 . The composition according to claim 21 , wherein the polyester-modified polycarbonate polyol has a hydroxyl content of 1.5-5 wt. % as measured in accordance with DIN EN ISO 4629-2, and a viscosity of 2500-18000 mPa·s as measured in accordance with DIN EN ISO 3219.

25 . The composition according to claim 21 , wherein the polyester-modified polycarbonate polyol is a polycaprolactone-modified aliphatic polycarbonate polyol.

26 . The composition according to claim 21 , wherein the polyester-modified polycarbonate polyol has an infrared characteristic peak at 1153-1173 cm −1 as measured with a Frontier™-series Fourier transform infrared spectrometer from PerkinElmer, Inc.

27 . The composition according to claim 21 , wherein the polyester-modified polycarbonate polyol is in an amount of 55-100 wt. %, based on that the weight of the hydroxyl-containing component is 100 wt. %.

28 . The composition according to claim 21 , wherein the polyester polyol has a number-average molecular weight of 200-5000 g/mol, and a viscosity of 1500-15000 mPa·s as measured in accordance with DIN EN ISO 3219.

29 . The composition according to claim 21 , wherein the polyester polyol has a hydroxyl content of 10-20 wt. % as measured in accordance with DIN EN ISO 4629-2.

30 . The composition according to claim 21 , wherein the polyacrylate polyol has a hydroxyl content of 2-5 wt. % as measured in accordance with DIN EN ISO 4629-2, and a viscosity of 2500-4000 mPa·s as measured in accordance with DIN EN ISO 3219.

31 . The composition according to claim 21 , wherein the polyacrylate polyol is in an amount of not greater than 10 wt. % based on that the weight of the hydroxyl-containing component is 100 wt. %.

32 . The composition according to claim 21 , wherein the polyisocyanate has an isocyanate group functionality of not less than 2.

33 . The composition according to claim 21 , wherein the polyisocyanate is one or more selected from the group consisting of aliphatic diisocyanates, alicyclic diisocyanates, aromatic diisocyanates, aliphatic triisocyanates, alicyclic triisocyanates, aromatic triisocyanates and derivatives having iminooxadiazinedione, isocyanurate, uretdione, carbamate, allophanate, biuret, urea, oxadiazinetrione, oxazolidone, acylurea or carbodiimide structures.

34 . The composition according to claim 21 , wherein the equivalent ratio of isocyanate groups to hydroxyl groups of the composition is 0.9-1.2.

35 . A method for preparing the coating composition according to claim 21 , comprising the steps of:
mixing a), optional b) and optional c) to obtain A); and mixing A) and B) to obtain the composition.

36 . A method comprising utilizing the coating composition according to claim 21 in the protection of a substrate surface or a substrate surface coating.

37 . The method according to claim 36 , wherein the substrate is selected from artificial stones, woods, artificial woods, marbles, terrazzos, ceramics, linoleums, metals, mineral materials, plastics, rubbers, concretes, composite boards, papers, leathers and glasses.

38 . A coating method comprising applying the coating composition according to claim 21 onto a substrate.

39 . A coated product comprising a substrate and a coating formed by applying the coating composition according to claim 21 onto the substrate.

40 . The coated product according to claim 39 , wherein the product is selected from windows, mirrors, furniture, floors, vehicles, road signs, bridges, books, boxes, films and lenses, most preferably selected from furniture, floors, films and vehicles.

Assignees

• Covestro Deutschland Ag

Inventors

• Liu Qinglan
• Xu Wen
• Li Jinqi

Classifications

• C08G18/7831

  containing biuret groups · CPC title

• C08G18/44 Primary

  Polycarbonates · CPC title

• C08G18/42

  Polycondensates having carboxylic or carbonic ester groups in the main chain · CPC title

• C08G18/6225

  Polymers of esters of acrylic or methacrylic acid · CPC title

• C08G18/4277

  Caprolactone and/or substituted caprolactone · CPC title