High-functionality polyisocyanates containing urethane groups

Patent metadata

Field	Value
Publication number	US-9550857-B2
Application number	US-201113181938-A
Country	US
Kind code	B2
Filing date	Jul 13, 2011
Priority date	Jul 13, 2010
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

The present invention relates to new, urethane-group-containing polyisocyanates based on aliphatic and/or cycloaliphatic diisocyanates, and to their use.

First claim

The invention claimed is:

1. A high-functionality polyisocyanate, comprising urethane groups and obtained by:
reacting
(a) at least one alkoxylated polyfunctional alcohol (A) obtained by alkoxylating trimethylolpropane with one or more alkyene-oxide units selected from the group consisting of ethylene oxide and propylene oxide, and having a OH-functionality which is on average more than 2;
(b) at least one polyisocyanate (B) having an NCO-functionality of more than 2, which comprises at least one selected from the group consisting of an isocyanurate group, a biuret group, a uretdione group, and an allophanate group and is constructed from at least one selected from the group consisting of an aliphatic isocyanate and a cycloaliphatic isocyanate,
under reaction conditions under which urethane groups are formed between (A) and (B),
with the proviso that a molar ratio of NCO groups to OH groups between (B) and (A) is at least 3:1, and
wherein the polyisocyanate (B) comprises a uretdione group.

2. The high-functionality polyisocyanate of claim 1 , wherein the polyisocyanate (B) comprises
at least one polyisocyanate comprising at least one isocyanurate group based on 1,6-hexamethylene diisocyanate, and having a viscosity of 600-3000 mPa*s.

3. A two-component coating composition, comprising the high functionality polyisocyanate of claim 1 .

4. A two-component coating composition, comprising:
at least one high-functionality polyisocyanate of claim 1 ;
at least one compound having at least 2 groups that are reactive toward isocyanate groups; and
optionally, at least one selected from the group consisting of a solvent, a pigment, an additive, and a thickener.

5. A process for preparing a polyurethane coating material, comprising:
reacting the high-functionality polyisocyanate of claim 1 with at least one binder which comprises isocyanate-reactive groups.

6. A process for preparing a polyurethane coating material, comprising:
reacting the high-functionality polyisocyanate of claim 1 with at least one binder selected from the group consisting of a polyacrylate polyol, a polyester polyol, a polyether polyol, a polyurethane polyol, a polyurea polyol, a polyetherol, a polycarbonate, a polyesterpolyacrylate polyol, a polyesterpolyurethane polyol, a polyurethanepolyacrylate polyol, a polyurethane-modified alkyd resin, a fatty-acid-modified polyesterpolyurethane polyol, a copolymer with at least one allyl ether, and a copolymer, and a graft polymer from at least one of the compounds stated.

7. A coating material, comprising the high-functionality polyisocyanate of claim 1 .

8. A refinish-coating composition, wood-coating composition, and/or vehicle coating composition, comprising the high-functionality polyisocyanate of claim 1 .

9. An adhesive or sealant, comprising the high-functionality polyisocyanate of claim 1 .

10. The coating material of claim 7 , which, in cured form, is a polyurethane coating material.

11. A method of curing a coating material, the method comprising
heating a coating material comprising the high-functionality polyisocyanate of claim 1 .

12. The high-functionality polyisocyanate of claim 1 , having an isocyanate group content of 12-50% by weight based on the total weight of the high-functionality polyisocyanate.

13. A polyurethane coating obtained by reacting the high-functionality polyisocyanate of claim 1 with a hydroxy-functional polyacrylate polyols at a stoichiometric NCO/OH ratio of 1:1.

14. The high-functionality polyisocyanate of claim 1 , wherein the alkoxylated polyfunctional alcohol (A) has an OH-functionality which is at least 3.

Assignees

• Elizalde Oihana
• Lucas Frederic
• Steinbrecher Angelika Maria
• Tuchbreiter Lydie
• Basf Se

Inventors

• Elizalde Oihana
• Lucas Frederic
• Steinbrecher Angelika Maria
• Tuchbreiter Lydie

Classifications

• C09D175/04

  Polyurethanes · CPC title

• C09J175/08

  from polyethers · CPC title

• C09J175/04

  Polyurethanes · CPC title

• C08G18/3206

  aliphatic · CPC title

• C08G18/6229

  Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols · CPC title