US4945128A — Dispersions of crosslinked polymer micro-particle…

Claim 1

Independent Claim 125 words

A dispersion of crosslinked polymer micro-particles in an aqueous medium, wherein the dispersion has been prepared: (1) by dispersing a mixture of the components (A) and (B) in an aqueous medium, the component (A) being composed of one or more polyester-polyols containing at least 2 hydroxyl groups, and the component (B) being composed of one or more polyisocyanate compounds, and the component (A) having available a number of ionic groups sufficient to form a stable dispersion, and at least one part of the components (A) and/or (B) containing more than 2 hydroxyl or isocyanate, respectively, groups per molecule and (2) by subsequently heating the dispersion thus obtained to a temperature sufficiently high for the components (A) and (B) to react to form crosslinked polymer micro-particles.

Claim 2

Dependent Claim 125 words

A dispersion of crosslinked polymer micro-particles in an aqueous medium, wherein the dispersion has been prepared: (1) by dispersing a mixture of the components (A) and (B) in an aqueous medium, the component (A) being composed of one or more polyester-polyols containing at least 2 hydroxyl groups, and the component (B) being composed of one or more polyisocyanate compounds, and the component (A) having available a number of ionic groups sufficient to form a stable dispersion, and at least one part of the components (A) and/or (B) containing more than 2 hydroxyl or isocyanate, respectively, groups per molecule and (2) by subsequently heating the dispersion thus obtained to a temperature sufficiently high for the components (A) and (B) to react to form crosslinked polymer micro-particles.

Claim 3

Dependent Claim 36 words

A dispersion as described in claim 1 wherein a polyesterpolyol in which the molecules each carry, on average, one carboxylate group as the ionic group and at least two hydroxyl groups is employed as component (A).

Claim 4

Dependent Claim 32 words

A dispersion as claimed in one of claims 1 or 2, wherein a polyisocyanate compound in which the isocyanate groups are attached to a aliphatic radical is employed as the component (B).

Claim 5

Dependent Claim 54 words

A dispersion as claimed in one of claims 1, 2 or 3, wherein the mixture of the components (A) and (B) is dispersed in the aqueous medium in the form of a solution or dispersion in a water-miscible, organic solvent or solvent mixture which boils below 100° C. and is inert towards isocyanate groups.

Claim 6

Dependent Claim 42 words

A dispersion as claimed in claim 4, wherein the organic solvent or solvent mixture is removed by distillation before the reaction of the components (A) and (B), at a temperature below the reaction temperature required for the formation of crosslinked polymer micro-particles.

Claim 7

Dependent Claim 39 words

A dispersion as claimed in claim 4, wherein the organic solvent or solvent mixture is removed by distillation at a temperature which is at least as high as the reaction temperature required for the formation of crosslinked polymer micro-particles.

Claim 8

Dependent Claim 53 words

A dispersion as claimed in one of claims 1, 2, 3, 4, 5 or 6 wherein the reaction of the components (A) and (B) to give crosslinked polymer micro-particles is carried out at a solids content of 30% by weight, and the solids content is reduced in the course of the crosslinking reaction.

Claim 9

Dependent Claim 28 words

A dispersion as claimed in claim 1, 2, 3, 4, 5, 6 or 7 wherein said crosslinked polymer micro-particles have a diameter from about 0.05 to 0.2 microns.

Claim 10

Dependent Claim 19 words

The use of the dispersions as claimed in one of claims 1 to 7 and 8 in coating compositions.

Claim 11

Dependent Claim 128 words

A process for the preparation of dispersions of crosslinked polymer micro-particles in aqueous media, wherein the dispersions are prepared: (1) by dispersing a mixture of the components (A) and (B) in an aqueous medium, the component (A) being composed of one or more polyester-polyols containing at least 2 hydroxyl groups, and the component (B) being composed of one or more polyisocyanate compounds, and the component (A) having available a number of ionic groups sufficient to form a stable dispersion, and at least one part of the components (A) and/or (B) containing more than 2 hydroxyl or isocyanate, respectively, groups per molecule and (2) by subsequently heating the dispersion thus obtained to a temperature sufficiently high for the components (A) and (B) to react to form cross-linked polymer micro-particles.

Claim 12

Dependent Claim 128 words

A process for the preparation of dispersions of crosslinked polymer micro-particles in aqueous media, wherein the dispersions are prepared: (1) by dispersing a mixture of the components (A) and (B) in an aqueous medium, the component (A) being composed of one or more polyester-polyols containing at least 2 hydroxyl groups, and the component (B) being composed of one or more polyisocyanate compounds, and the component (A) having available a number of ionic groups sufficient to form a stable dispersion, and at least one part of the components (A) and/or (B) containing more than 2 hydroxyl or isocyanate, respectively, groups per molecule and (2) by subsequently heating the dispersion thus obtained to a temperature sufficiently high for the components (A) and (B) to react to form cross-linked polymer micro-particles.

Claim 13

Dependent Claim 45 words

A process as described in claim 10 wherein the reaction of components (A) and (B) to give crosslinked polymer micro-particles is carried out at as a solids content of 30% by weight, and the solids content is reduced in the course of the crosslinking reaction.

Claim 14

Dependent Claim 22 words

A process as described in claim 10 wherein said crosslinked polymer micro-particles formed have a diameter from about 0.05 to 0.2 microns.

Claim 15

Dependent Claim 34 words

A process as defined in claim 10 wherein component (A) is a polyester-polyol in which the molecules each carry, on average, one carboxylate group as the ionic group and at least two hydroxyl groups.

Claim 16

Dependent Claim 28 words

A process as defined in claim 10 wherein a polyisocyanate compound is employed as component (B) and in which the isocyanate groups are attached to a (cyclo)aliphatic radical.

Claim 17

Dependent Claim 49 words

A process as defined in claim 14 wherein the mixture of components (A) and (B) is dispersed in the aqueous medium in the form of a solution or dispersion in a water miscible, organic solvent or solvent mixture, which boils below 100° C. and is inert towards isocyanate groups.

Claim 18

Dependent Claim 42 words

A process as described in claim 15 wherein the organic solvent or solvent mixture is removed by distillation before the reaction of the components (A) and (B) at a temperature below the reaction temperature required for the formation of crosslinked polymer micro-particles.

Claim 19

Dependent Claim 39 words

A process as defined in claim 15 wherein the organic solvent or solvent mixture is removed by distillation at a temperature which is at least as high as the reaction temperature required for the formation of crosslinked polymer micro-particles.

Claim 20

Dependent Claim 165 words

A coating composition which is composed of a dispersion of crosslinked polymer micro-particles in an aqueous medium and which, in addition to the polymer microparticles, can also additionally contain further film-forming material, pigments and further customary additives, and which is suitable for the production of base coats of multi-coat, protective or decorative coatings, wherein the dispersion of crosslinked polymer micro-particles in an aqueous medium has been prepared: (1) by dispersing a mixture of the components (A) and (B) in an aqueous medium, the component (A) being composed of one or more polyester-polyols containing at least 2 more polyisocyanate compounds, and the component (A) having available a number of ionic groups sufficient to form a stable dispersion, and at least one part of the components (A) and/or (B) containing more than 2 hydroxyl or isocyanate, respectively, groups per molecule and (2) by subsequently heating the dispersion thus obtained to a temperature sufficiently high for the components (A) and (B) to react to form crosslinked polymer microparticles.

Claim 21

Dependent Claim 165 words

A coating composition which is composed of a dispersion of crosslinked polymer micro-particles in an aqueous medium and which, in addition to the polymer microparticles, can also additionally contain further film-forming material, pigments and further customary additives, and which is suitable for the production of base coats of multi-coat, protective or decorative coatings, wherein the dispersion of crosslinked polymer micro-particles in an aqueous medium has been prepared: (1) by dispersing a mixture of the components (A) and (B) in an aqueous medium, the component (A) being composed of one or more polyester-polyols containing at least 2 more polyisocyanate compounds, and the component (A) having available a number of ionic groups sufficient to form a stable dispersion, and at least one part of the components (A) and/or (B) containing more than 2 hydroxyl or isocyanate, respectively, groups per molecule and (2) by subsequently heating the dispersion thus obtained to a temperature sufficiently high for the components (A) and (B) to react to form crosslinked polymer microparticles.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1993-07-30	1994-01-29	1994-07-31	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1997-07-30	1998-01-29	1998-07-31	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2001-07-30	2002-01-29	2002-07-31	$7700.00	Window Closed / Lapsed

Dispersions of crosslinked polymer micro-particles in aqueous media, a process for the preparation of these dispersions, and coating compositions containing these dispersions

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