US5728779A — Powder paint of epoxy-reactive polymer and alipha…

Claim 1

Independent Claim 204 words

A process for preparing a wholly or partially coated substrate by applying a powder plant consisting essentially of (i) a polyester polymer having carboxyl functional groups capable of reacting with epoxy groups wherein said polymer has an acid number higher than 10 and less than 50, (ii) a crosslinker containing epoxy groups and having an epoxy functionality greater than 1, wherein said crosslinker (ii) contains at least one epoxidized oil having at least one epoxy-functional C 5 -C 26 linear or branched aliphatic chain, and (iii) at least one member selected from the group consisting of a catalyst, curing agent other than the epoxidized oil, pigment, fillers, and additives other than the pigment or fillers on a substrate to obtain a coating; and curing the coating by exposure to heat at an elevated temperature to obtain a cured coating; wherein (a) the polymer capable of reacting with epoxy groups (i), the crosslinker (ii), optionally an amount of catalyst and optionally an amount of curing agent are selected so that the curing reaction is substantially complete within 30 minutes at 200° C., and (b) the amount of said epoxidized oil is such that more than 35% of the crosslinking is obtained through said epoxidized oil.

Claim 2

Dependent Claim 204 words

A process for preparing a wholly or partially coated substrate by applying a powder plant consisting essentially of (i) a polyester polymer having carboxyl functional groups capable of reacting with epoxy groups wherein said polymer has an acid number higher than 10 and less than 50, (ii) a crosslinker containing epoxy groups and having an epoxy functionality greater than 1, wherein said crosslinker (ii) contains at least one epoxidized oil having at least one epoxy-functional C 5 -C 26 linear or branched aliphatic chain, and (iii) at least one member selected from the group consisting of a catalyst, curing agent other than the epoxidized oil, pigment, fillers, and additives other than the pigment or fillers on a substrate to obtain a coating; and curing the coating by exposure to heat at an elevated temperature to obtain a cured coating; wherein (a) the polymer capable of reacting with epoxy groups (i), the crosslinker (ii), optionally an amount of catalyst and optionally an amount of curing agent are selected so that the curing reaction is substantially complete within 30 minutes at 200° C., and (b) the amount of said epoxidized oil is such that more than 35% of the crosslinking is obtained through said epoxidized oil.

Claim 3

Dependent Claim 27 words

Process according to claim 1, wherein the amount of said epoxidized oil is such that more than 50% of the crossllnking is obtained through said epoxidized oil.

Claim 4

Dependent Claim 28 words

A process according to claim 1, wherein the amount of oxirane oxygen originating from said epoxidized oil is greater than 0.1 meq/gram of crosslinker (ii) and polymer (i).

Claim 5

Dependent Claim 23 words

A process according to claim 1, wherein the powder paint contains between 3 and 20 wt. % aliphatic chains carrying an epoxy group.

Claim 6

Dependent Claim 19 words

A process according to claim 1, wherein said epoxidized oil contains internal epoxy groups according to formula (I) ##STR2##

Claim 7

Dependent Claim 22 words

A process according to claim 1, wherein the epoxidized oil contains aliphatic esters having an epoxy group carried on the aliphatic chain.

Claim 8

Dependent Claim 18 words

A process according to claim 1, wherein the Tg of the polymer (i) is greater than 30° C.

Claim 9

Dependent Claim 25 words

A process according to claim 1, wherein the viscosity of the polymer (i) is less than 8000 dPas, measured at 158° C. according to Emila.

Claim 10

Dependent Claim 21 words

A process according to claim 1, wherein the polymer (i) has a Tg of about 60° C. to about 90° C.

Claim 11

Dependent Claim 13 words

A process according to claim 1, wherein the powder paint contains a catalyst.

Claim 12

Dependent Claim 13 words

A process according to claim 10, wherein said catalyst is a lithium alkanolate.

Claim 13

Dependent Claim 45 words

A process according to claim 1, wherein said polymer (i) and said crosslinker (ii) constitute a binder, said binder having a Tg greater than about 30° C., and said polymer having a viscosity of less than 8000 dPas (measured at 158° C. according to Emila).

Claim 14

Dependent Claim 33 words

A process according to claim 1, wherein in said at least one epoxidized oil the epoxy functionality is not composed of terminal epoxy groups, said crosslinker has an epoxy functionality greater than 2.1.

Claim 15

Dependent Claim 187 words

A process for preparing a wholly or partially coated substrate by applying a powder paint comprised of (i) a polyester polymer having carboxyl functional groups capable of reacting with epoxy groups and wherein said polymer (i) has an acid number higher than 10 and less than 50, (ii) a crosslinker which consists essentially of at least one epoxidized oil which has an epoxy functionality greater than 1 and contains at least one epoxy-functional C 5 -C 26 linear or branched aliphatic chain, wherein said crosslinker is essentially the sole crosslinker, and (iii) at least one member selected from the group consisting of a catalyst, curing agent other than the epoxidized oil, pigment, fillers, and additives other than the pigment or fillers on a substrate to obtain a coating; and curing the coating by exposure to heat at an elevated temperature to obtain a cured coating wherein (a) the polymer capable of reacting with epoxy groups (i), the crosslinker (ii), optionally an amount of catalyst and optionally an amount of curing agent are selected so that the curing reaction is substantially complete within 30 minutes at 200° C.

Claim 16

Dependent Claim 187 words

A process for preparing a wholly or partially coated substrate by applying a powder paint comprised of (i) a polyester polymer having carboxyl functional groups capable of reacting with epoxy groups and wherein said polymer (i) has an acid number higher than 10 and less than 50, (ii) a crosslinker which consists essentially of at least one epoxidized oil which has an epoxy functionality greater than 1 and contains at least one epoxy-functional C 5 -C 26 linear or branched aliphatic chain, wherein said crosslinker is essentially the sole crosslinker, and (iii) at least one member selected from the group consisting of a catalyst, curing agent other than the epoxidized oil, pigment, fillers, and additives other than the pigment or fillers on a substrate to obtain a coating; and curing the coating by exposure to heat at an elevated temperature to obtain a cured coating wherein (a) the polymer capable of reacting with epoxy groups (i), the crosslinker (ii), optionally an amount of catalyst and optionally an amount of curing agent are selected so that the curing reaction is substantially complete within 30 minutes at 200° C.

Claim 17

Dependent Claim 27 words

A process according to claim 1, wherein said epoxidized oil the at least one epoxy-functional chain is a C 5 -C 22 linear or branched aliphatic chain.

Claim 18

Dependent Claim 17 words

A process according to claim 1, wherein the polymer (i) has a acid number less than 35.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2001-03-16	2001-09-15	2002-03-17	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2005-03-16	2005-09-15	2006-03-17	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2009-03-16	2009-09-15	2010-03-17	$7700.00	Window Closed / Lapsed

Powder paint of epoxy-reactive polymer and aliphatic chain-containing polyepoxide

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