One component polyurethane dispersion for vinyl windows

Patent metadata

Field	Value
Publication number	US-2019040252-A1
Application number	US-201815945865-A
Country	US
Kind code	A1
Filing date	Apr 5, 2018
Priority date	Aug 2, 2017
Publication date	Feb 7, 2019
Grant date	—

Abstract

The present invention provides an aqueous polyurethane dispersion (PUD) comprising an amorphous polyester having a glass transition temperature (T g ) as determined by differential scanning calorimetry of less than −30° C.; wherein the aqueous polyurethane dispersion (PUD) has a glass transition temperature (T g ) as determined by differential scanning calorimetry (DSC) of 0° C. to 20° C. and a hard block content of greater than 50%. Coatings, adhesives, sealants and paints made from the inventive aqueous polyurethane dispersion (PUD) pass detergent resistance testing according to the American Architectural Manufacturers Association's standard, AAMA 615-13, have a pencil hardness according to ASTM D3363 of at least 3H, and are particularly suited for use on low surface energy substrates such as vinyl surfaces including floors, windows, doors, window frames, door frames, window shutters, railing, gates, pillars, arbors, pergolas, trellises, gazebos, posts, fencing, pipes and fittings, wire and cable insulation, automobile components, credit cards, and siding.

First claim

1 . An aqueous polyurethane dispersion (PUD) comprising the reaction product of:
(i) a polyisocyanate; (ii) a polymeric polyol having a number average molecular weight of 400 to 8,000 g/mol; (iii) a compound comprising at least one isocyanate-reactive group and an anionic group or potentially anionic group; (iv) an amorphous polyester having a glass transition temperature (T g ) as determined by differential scanning calorimetry (DSC) of less than −30° C.; (v) water; (vi) a mono functional polyalkylene ether; (vii) a polyol having a molecular weight of less than <400 g/mol, and (viii) a polyamine or amino alcohol having a molecular weight of 32 to 400 g/mol, wherein the aqueous polyurethane dispersion (PUD) has a glass transition temperature (T g ) as determined by differential scanning calorimetry (DSC) of 0° C. to 20° C. and a hard block content of greater than 50%.

2 . The aqueous polyurethane dispersion (PUD) according to claim 1 , wherein the amorphous polyester (iv) comprises ortho-phthalic anhydride.

3 . The aqueous polyurethane dispersion (PUD) according to claim 1 , wherein the dispersion has a hard block content of 50% to 60%.

4 . The aqueous polyurethane dispersion (PUD) according to claim 1 , wherein the dispersion has a hard block content of greater than 55% to 60%.

5 . The aqueous polyurethane dispersion (PUD) according to claim 1 , wherein the amorphous polyester (iv) has a molecular weight of 300 to 3000.

6 . The aqueous polyurethane dispersion (PUD) according to claim 1 , wherein the amorphous polyester (iv) has a molecular weight of 1000.

7 . The aqueous polyurethane dispersion (PUD) according to claim 1 , wherein the polyisocyanate (i) is selected from the group consisting of 1,6-hexamethylene diisocyanate (HDI), pentamethylene diisocyanate (PDI), isophorone diisocyanate (IPDI), 2,2,4- and 2,4,4-trimethyl-hexamethylene diisocyanate, isomeric bis-(4,4′-isocyanatocyclohexyl)methanes or mixtures thereof of any desired isomer content, 1,4-cyclohexylene diisocyanate, 1,4-phenylene diisocyanate, 2,4- and 2,6-toluene diisocyanate or hydrogenated 2,4- and 2,6-toluene diisocyanate, 1,5-naphthalene diisocyanate, 2,4′- and 4,4′-diphenylmethane diisocyanate, 1,3- and 1,4-bis-(2-isocyanato-prop-2-yl)-benzene (TMXDI), 1,3-bis(isocyanato-methyl)benzene (XDI), and (S)-alkyl 2,6-diisocyanato-hexanoates or (L)-alkyl 2,6-diisocyanatohexanoates.

8 . The aqueous polyurethane dispersion (PUD) according to claim 1 , wherein the PUD contains n-methyl-2-pyrrolidone (NMP).

9 . The aqueous polyurethane dispersion (PUD) according to claim 1 , wherein the PUD is substantially free of n-methyl-2-pyrrolidone (NMP).

10 . One of a coating, an adhesive, and a sealant comprising the aqueous polyurethane dispersion (PUD) according to claim 1 .

11 . A coating containing the aqueous polyurethane dispersion (PUD) according to claim 1 , wherein the coating passes detergent resistance testing according to AAMA 615-13 with a minimum 90% gloss retention, a maximum color change of 5 delta E, with no blistering, with no loss of adhesion after testing and has a pencil hardness according to ASTM D3363 of at least 3H.

12 . A coating containing the aqueous polyurethane dispersion (PUD) according to claim 1 , wherein the coating exhibits no staining by betadine after four hours.

13 . A coating containing the aqueous polyurethane dispersion (PUD) according to claim 1 , wherein the coating passes humidity resistance testing according to ASTM D714 with no blistering.

14 . The coating according to claim 9 having a pencil hardness according to ASTM D3363 of from 3H to 6H.

15 . A substrate having applied thereto the coating according to claim 11 .

16 . The substrate according to claim 15 , wherein the substrate is polyvinylchloride.

17 . The substrate according to claim 16 wherein the substrate is selected from the group consisting of floors, windows, doors, window frames, door frames, window shutters, window surrounds railing, gates, pillars, arbors, pergolas, trellises, gazebos, posts, fencing, pipes and fittings, wire and cable insulation, automobile components, credit cards, cladding and siding.

18 . A coating containing an aqueous polyurethane dispersion (PUD),
wherein the coating passes detergent resistance testing according to AAMA 615-13 with a minimum 90% gloss retention, a maximum color change of 5 delta E, with no blistering and no loss of adhesion after testing, wherein the coating exhibits no staining by betadine after four hours, wherein the coating passes humidity resistance testing according to ASTM D714 with no blistering and wherein the coating has a pencil hardness according to ASTM D3363 of at least 3H.

19 . The coating according to claim 18 , wherein the aqueous polyurethane dispersion (PUD) comprises the reaction product of:
(i) a polyisocyanate; (ii) a polymeric polyol having a number average molecular weight of 400 to 8,000 g/mol; (iii) a compound comprising at least one isocyanate-reactive group and an anionic group or potentially anionic group; (iv) an amorphous polyester having a glass transition temperature (T g ) as determined by differential scanning calorimetry (DSC) of less than −30° C.; (v) water; (vi) a mono functional polyalkylene ether; (vii) a polyol having a molecular weight of less than <400 g/mol, and (viii) a polyamine or amino alcohol having a molecular weight of 32 to 400 g/mol, wherein the aqueous polyurethane dispersion (PUD) has a glass transition temperature (T g ) as determined by differential scanning calorimetry (DSC) of 0° C. to 20° C. and a hard block content of greater than 50%.

20 . The coating according to claim 19 , wherein the amorphous polyester (iv) comprises ortho-phthalic anhydride.

21 . The coating according to claim 18 , wherein the PUD contains n-methyl-2-pyrrolidone (NMP).

22 . The coating according to claim 18 , wherein the PUD is substantially free of n-methyl-2-pyrrolidone (NMP).

23 . A paint comprising the coating according to claim 18 .

24 . The paint according to claim 23 , wherein the aqueous polyurethane dispersion (PUD) comprises the reaction product of:
(i) a polyisocyanate; (ii) a polymeric polyol having a number average molecular weight of 400 to 8,000 g/mol; (iii) a compound comprising at least one isocyanate-reactive group and an anionic group or potentially anionic group; (iv) an amorphous polyester having a glass transition temperature (T g ) as determined by differential scanning calorimetry (DSC) of less than −30° C.; (v) water; (vi) a mono functional polyalkylene ether; (vii) a polyol having a molecular weight of less than <400 g/mol, and (viii) a polyamine or amino alcohol having a molecular weight of 32 to 400 g/mol, wherein the aqueous polyurethane dispersion (PUD) has a glass transition temperature (T g ) as determined by differential scanning calorimetry (DSC) of 0° C. to 20° C. and a hard block content of greater than 50%.

25 . The paint according to claim 24 , wherein the amorphous polyester (iv) comprises ortho-phthalic anhydride.

26 . The paint according to claim 23 , wherein the PUD contains n-methyl-2-pyrrolidone (NMP).

27 . The paint according to claim 23 , wherein the PUD is substantially free of n-methyl-2-pyrrolidone (NMP).

28 . A substrate having applied thereto the paint according to claim 23 .

Assignees

• Covestro Llc
• Covestro Deutschland Ag

Inventors

• Goldfein Stephanie
• Nakao Makoto
• Gindin Lyubov
• Grablowitz Hans Georg
• Konitsney Ronald
• Henderson Derick
• Kasardo Tina

Classifications

• C09D175/04

  Polyurethanes · CPC title

• C08L2201/52

  Aqueous emulsion or latex, e.g. containing polymers of a glass transition temperature (Tg) below 20°C · CPC title

• C08G18/3203

  Polyhydroxy compounds · CPC title

• C08L75/04 Primary

  Polyurethanes · CPC title

• C08K5/3415

  Five-membered rings · CPC title