Two-component putty, method for coating a substrate with such putty, substrates coated with such putty

Patent metadata

Field	Value
Publication number	US-10647859-B2
Application number	US-201716302214-A
Country	US
Kind code	B2
Filing date	May 30, 2017
Priority date	May 31, 2016
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

The present invention relates to a two-component putty comprising (1) a base component and (2) a curing component, wherein the base component comprises: —castor oil as resin component; and —a further resin component having a hydroxyl number in the range of from 00 to 800 mg KOH/g, wherein the curing component comprises a polyisocyanate, and wherein the two-component putty further comprises hollow microspheres and an organically modified inorganic filler. The present invention also relates to a method for coating a substrate by applying such putty and allowing the applied putty to cure. The invention further relates to a coated substrate obtainable by such method.

First claim

The invention claimed is:

1. A two-component putty comprising (1) a base component and (2) a curing component,
wherein the base component comprises:
castor oil as resin component; and
a further resin component having a hydroxyl number in the range of from 500 to 800 mg KOH/g,

wherein the curing component comprises a polyisocyanate,
and wherein the two-component putty further comprises hollow microspheres and an organically modified inorganic filler,
wherein the putty comprises
15 to 50 wt % castor oil as resin component;
2 to 25 wt % of the further resin component;
20 to 60 wt % polyisocyanate;
0.5 to 5.0 wt % hollow microspheres; and
5 to 30 wt % organically modified inorganic filler,

based on the total weight of the putty.

2. The two-component putty according to claim 1 , wherein the further resin component has an OH number in the range of from 600 to 800 mg KOH/g.

3. The two-component putty according to claim 1 , wherein the polyisocyanate is an aliphatic polyisocyanate containing a biuret group.

4. The two-component putty according to claim 1 , wherein the organically modified inorganic filler is organically modified calcium carbonate.

5. The two-component putty according to claim 1 , wherein the organically modified inorganic filler is an inorganic filler modified with fatty acids.

6. The two-component putty according to claim 1 , wherein the hollow microspheres are organic hollow microspheres.

7. The two-component putty according to claim 1 , wherein the viscosity of the putty as measured by rotary viscometer at a shearing rate of 1 s −1 and at a temperature of 23° C., 30 seconds after having combined and mixed the base component and the curing component, is in the range of from 20,000 to 250,000 mPa·s.

8. A method for coating a substrate, comprising:
applying a two-component putty according to claim 1 to a substrate; and
allowing the applied putty to cure.

9. The method according to claim 8 , wherein the putty is applied directly to the substrate.

10. The method according to claim 8 , wherein the substrate is a plastic substrate.

11. A coated substrate obtainable by a method according to claim 8 .

12. The two-component putty according to claim 1 wherein the hollow microspheres are polymeric hollow microspheres.

13. The two-component putty according to claim 7 wherein wherein the viscosity of the putty as measured by rotary viscometer at a shearing rate of 1 s −1 and at a temperature of 23° C., 30 seconds after having combined and mixed the base component and the curing component, is in the range of from 30,000 to 200,000 mPa·s.

14. The two-component putty according to claim 7 wherein wherein the viscosity of the putty as measured by rotary viscometer at a shearing rate of 1 s −1 and at a temperature of 23° C., 30 seconds after having combined and mixed the base component and the curing component, is in the range of from 40,000 to 150,000 mPa·s.

15. The method according to claim 8 wherein the applied putty is allowed to cure at a temperature of at most 80° C.

16. The method according to claim 8 wherein the applied putty is allowed to cure at a temperature in the range of from 15° C. to 60° C.

17. The method according to claim 8 wherein the substrate is an epoxy resin based plastic substrate.

18. The method according to claim 8 wherein the substrate is a fiber-reinforced epoxy resin-based plastic substrate.

Assignees

• Akzo Nobel Coatings Int Bv

Inventors

• Shishkov Igor
• Seeger Dirk
• Krupp Julia
• Felker Johannes

Classifications

• C09D5/34 Primary

  Filling pastes (materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12) · CPC title

• C08L91/00

  Compositions of oils, fats or waxes; Compositions of derivatives thereof · CPC title

• C09D7/62

  modified by treatment with other compounds · CPC title

• C08K2003/265

  Calcium, strontium or barium carbonate · CPC title

• C09D7/70

  characterised by shape, e.g. fibres, flakes or microspheres · CPC title