ENVIRONMENTALLY FRIENDLY WATERBASED ENGINEERING POLYMER COMPOSITIONS

Abstract

The present invention relates to an aqueous composition comprising: ?Water; ?A reaction product obtained by reacting ?a polyamideimide polymer obtainable by reacting suitable starting materials in N-n-butyl pyrrolidone at a temperature in the range from 80-120? C. until a polymer is formed with an Mw of between 10000 to 40000 g/mol (Dalton) and a Mw/Mn ratio between 1.1 and 2, with ?an amine compound; ?Optionally an amine compound, and ?N-n-butylpyrrolidone. and the use thereof in coating compositions.

Claims

1. Aqueous composition comprising: a. water; b. a reaction product obtained by reacting components comprising: b1. a polyamideimide polymer obtainable obtained by reacting suitable starting materials in N-n-butyl pyrrolidone at a temperature in the range from 80-120? C. until a polymer is formed with an Mw of between 10000 to 40000 g/mol (Dalton) and a Mw/Mn ratio between 1.1 and 2 (wherein Mw and Mn are measured in accordance with DIN 55672-2), with b2. an amine compound; and c. N-n-butylpyrrolidone.

2. The aqueous composition of claim 1, wherein the suitable starting materials include a mixture comprising tricarboxylic acid, or an anhydride thereof, having 2 carboxyl groups in a vicinal position, a diisocyanate, and a low molecular weight monocarboxylic acid.

3. A coating composition comprising the aqueous solution of claim 1 and one or more of a dry lubricant, a pigment, an additional solvent, a functional filler, a functional additive, an acidic additive, or an alkaline additive.

4. The coating composition of claim 3, comprising 20-30 wt. % of a polyamic acid amine salt, the salt comprising (i.e. the reaction product of the polyamideimide polymer and an amine compound); 30-40 wt. % of NBP; 15-20 wt. % of an amine; 15-25 wt. % of water; and 0-10 wt. % of other ingredients; wherein the wt. % are based upon the total content of the composition.

5. The coating composition of claim 4, comprising from 0.5 to 20 wt. %, based on the solid content of the composition of dry lubricants; from 0.0 wt. % to 50 wt. %, based on the solid content of the composition of one or more pigments; from 0.0-20 wt. %, based on the total content of the coating composition of additional solvent; from 0.0 wt. % to 50 wt. %, based on the solid content of the coating composition of functional fillers; from 0.0 wt. % to 20 wt. %, based on the solid content of the coating composition of functional additives; from 0.0 to 5 wt. %, based on the total content of the coating composition of acidic or alkaline additives.

6. A method of coating a substrate comprising coating a substrate with the coating composition of claim 3.

7. The method according to claim 6, wherein the coating composition is applied to the substrate, followed by drying at a drying temperature in the range of 40? C. to 130? C.

8. A coating layer on a substrate obtained by coating the substrate with a coating composition of claim 3, followed by drying at a drying temperature in the range of 40? C. to 130? C., wherein the coating layer has a dry film thickness (DFT) in the range of below 5 microns to 60 microns.

9. The aqueous composition of claim 1, the composition further comprising an amine compound.

10. The aqueous composition of claim 9, wherein the suitable starting materials include a mixture comprising tricarboxylic acid, or an anhydride thereof, having 2 carboxyl groups in a vicinal position, a diisocyanate, and a low molecular weight monocarboxylic acid.

11. A coating composition comprising the aqueous solution of claim 9 and one or more of a dry lubricant, a pigment, an additional solvent, a functional filler, a functional additive, an acidic additive, or an alkaline additive.

12. The coating composition of claim 11, comprising 20-30 wt. % of a polyamic acid amine salt, the salt comprising the reaction product of the polyamideimide polymer and an amine compound; 30-40 wt. % of NBP; 15-20 wt. % of an amine; 15-25 wt. % of water; and 0-10 wt. % of other ingredients; wherein the wt. % are based upon the total content of the composition.

13. The coating composition of claim 12, comprising from 0.5 to 20 wt. %, based on the solid content of the composition of dry lubricants; from 0.0 wt. % to 50 wt. %, based on the solid content of the composition of one or more pigments; from 0.0-20 wt. %, based on the total content of the coating composition of additional solvent; from 0.0 wt. % to 50 wt. %, based on the solid content of the coating composition of functional fillers; from 0.0 wt. % to 20 wt. %, based on the solid content of the coating composition of functional additives; and from 0.0 to 5 wt. %, based on the total content of the coating composition of acidic or alkaline additives.

14. A method of coating a substrate comprising coating a substrate with the coating composition of claim 11.

15. The method according to claim 14, wherein the coating composition is applied to the substrate, followed by drying at a drying temperature in the range of 40? C. to 130? C.

16. A coating layer on a substrate obtained by coating the substrate with a coating composition of claim 11, followed by drying at a drying temperature in the range of 40? C. to 130? C., wherein the coating layer has a dry film thickness (DFT) in the range of below 5 microns to 60 microns.

Description

EXAMPLES

Example 1: Preparation of Polyamideimide

[0053] 18.08 parts by weight (pbw) of trimellitic anhydride, 23.5 pbw of 4,4-diphenylmethane diisocyanate, 0.12 pbw of formic acid and 58.29 pbw of NBP were charged in a reaction vessel and heated up to 85? C. The mixture was held for 2 hours at 85? C., then slowly heated up to 100? C. The temperature in the reaction vessel was kept at this temperature for two hours. Thereafter, the heating of the reaction vessel was stopped and a polyamideimide solution in NBP was obtained. The Mw and Mn of the obtained polyamideimide was measured in accordance with DIN 55672-2 at 16000 g/mol and 10000 g/mol, respectively, hence the polyamideimide in solution had a Mw/Mn ration of 1.6.

Example 2: Preparation of Polyamideimide Solution in Water

[0054] 62.62 pbw of the polyamideimide solution in NBP produced according to example 1 was reacted with 5.52 pbw of dimethylethanolamine at a temperature between 50 and 80? C. for a time between 4 and 6 hours. The obtained polyamic acid amine salt (PAAA-salt) was dissolved in 7.37 pbw of water and kept under stirring at 70-75? C. until complete homogeneous solution was obtained. An aqueous solution containing 50% by weight of dimethylethanolamine was added until a solid content of 25.0% was obtained. The solid content was measured by weighting 2.5 gr of product in a 5 cm diameter disk, then putting it in an oven for 20 at 250? C. This PAAA-salt solution in water has a viscosity of 2420 mPa.Math.s at 22? C. measured with HAAKE VISCOTESTER 550 at shear rate of 160 s.sup.?1 and coaxial cylinder measuring system for a time of two minutes. The final composition of the obtained product is wt. % PAAA-salt, 37 wt. % NBP, 18 wt. % DMEA and 20 wt. % water, wherein the wt. % is based upon the total weight of the composition.

Example 3: Preparation of Low Viscosity Polyamideimide Solution in Water

[0055] 62.62 pbw of the polyamideimide solution in NBP produced according to example 1 was reacted with 5.52 pbw of dimethylethanolamine between 50 and 80? C. for a time between 6 and 8 hours. The obtained polyamic acid amine salt (PAAA-salt) was dissolved in 7.37 pbw of water and kept under stirring at 70-75? C. until complete homogeneous solution was obtained. An aqueous solution containing 50% by weight of dimethylethanolamine was added until a solid content of 25.0% was obtained. This PAAA-salt solution in water has a viscosity of 1550 mPa.Math.s at 22? C. measured with HAAKE VISCOTESTER 550 at shear rate of 160 s.sup.?1 and coaxial cylinder measuring system for a time of two minutes. The final composition of the obtained product is 25% PAAA-salt, 37% NBP, 18% DMEA and 20% water, wherein the wt. % is based upon the total weight of the composition.

Example 4 Preparation of High Solid Polyamideimide Solution in Water

[0056] 62.62 pbw of the polyamideimide solution in NBP produced according to example 1 was reacted with 5.52 pbw of dimethylethanolamine between 50 and 80? C. for a time between 4 and 6 hours. The obtained polyamic acid amine salt (PAAA-salt) was dissolved in 7.37 pbw of water and kept under stirring at 70-75? C. until complete homogeneous solution was obtained. An aqueous solution containing 50% by weight of dimethylethanolamine was added until a solid content of 28.5% was obtained. This PAAA-salt solution in water has a viscosity of 2420 mPa.Math.s at 22? C. measured with HAAKE VISCOTESTER 550 at shear rate of 160 s.sup.?1 and coaxial cylinder measuring system for a time of two minutes. The final composition of the obtained product is 28.4% PAAA-salt, 42% NBP, 13.6% DMEA and 16% water, wherein the wt. % is based upon the total weight of the composition.

Example 5: Preparation of Polyamideimide Solution in Water. (Comparative Example)

[0057] 62.62 pbw of the polyamideimide solution in NBP produced according to example 1 was used to precipitate the PAI from the solution by using a non-solvent (ethanol). The obtained fine powder was dried. Thereafter, the 22.54 pbw of the PAI powder was reacted with 4.97 pbw of dimethylethanolamine. The obtained polyamic acid amine salt was dissolved in 6.66 pbw of water and kept under stirring at 70-75? C. until a complete homogeneous solution was obtained. An aqueous solution containing 50% by weight of dimethylethanolamine was added to obtain an aqueous solution with a viscosity that is normally used for coating applications. The solution had a solid content of about 10%.