Polyester in-mould coating powder

Claim 2

In a powdered coating agent, suitable for application in the in-mould coating techinque, composed of a bonding agent comprising an unsaturated polyester resin, a curing catalyst and other additives, the improvement consisting essentially of a bonding agent composed of at least 85% by weight of a crystalline polyester, said crystalline polyester composed of at least 80% by weight of (i) a symmetric unsaturated dicarboxylic acid, a symmetric saturated dicarboxylic acid and an aromatic dicarboxylic acid and (ii) a symmetric aliphatic diol, said bonding agent having a melting point of at least 40° C., a degree of unsaturation of between 1 and 5 moles unsaturation per 1000 grams of said polyester and a viscosity in the melt at 120° C. of at least 1 dPa.s.

Claim 3

Coating agent according to claim 1, characterized in that the crystalline polyester has a melting point of at least 50° C.

Claim 4

Coating agent according to claim 1, characterized in that the crystalline polyester has a melting point of at least 70° C.

Claim 5

Coating agent according to claim 1, characterized in that the crystalline polyester has a degree of unsaturation of between 2.0 and 3.75 moles/1000 g.

Claim 6

Coating agent according to claim 1, characterized in that the crystalline polyester has a viscosity in the melt at 120° C. of at least 15 dPa.s.

Claim 7

Coating agent according to claim 1, wherein said symmetric unsaturated dicarboxylic acid is fumaric acid.

Claim 8

Coating agent according to claim 1, wherein said symmetric unsaturated dicarboxylic acid and said aromatic dicarboxylic acid contain 2 to 12 carbon atoms.

Claim 9

A coating agent according to claim 7, wherein said aromatic dicarboxylic acid is terephtalic acid.

Claim 10

Process for preparing a polyester based and cured object composed of an unsaturated polyester with fillers and/or reinforcing materials in or on a mould, wherein said process the interior surface of said mould is first coated over the entire surface area or a part thereof at a temperature between 75° C. and 200° C. with a polyester-based thermosetting coating powder which subsequently flows out and cures to form a coating on said surface upon which coating said polyester based object is moulded, wherein said process said coating powder is a powder composed of an unsaturated polyester resin bonding agent, a curing catalyst and other additives, said bonding agent consisting essentially of at least 85% by weight of a crystalline polyester composed of at least 80% by weight of (i) a symmetric unsaturated dicarboxylic acid, a symmetric saturated dicarboxylic acid and an aromatic dicarboxylic acid and (ii) a symmetric aliphatic diol, said bonding agent having (a) a melting point of at least 40° C., (b) a degree of unsaturation of between 1 and 5 moles unsaturation per 1000 grams polyester and (c) a viscosity in the melt at 120° C. of at least 1 dPa.s.

Claim 11

Process for preparing a polyester based and cured object composed of an unsaturated polyester with fillers and/or reinforcing materials in or on a mould, wherein said process the interior surface of said mould is first coated over the entire surface area or a part thereof at a temperature between 75° C. and 200° C. with a polyester-based thermosetting coating powder which subsequently flows out and cures to form a coating on said surface upon which coating said polyester based object is moulded, wherein said process said coating powder is a powder composed of an unsaturated polyester resin bonding agent, a curing catalyst and other additives, said bonding agent consisting essentially of at least 85% by weight of a crystalline polyester composed of at least 80% by weight of (i) a symmetric unsaturated dicarboxylic acid, a symmetric saturated dicarboxylic acid and an aromatic dicarboxylic acid and (ii) a symmetric aliphatic diol, said bonding agent having (a) a melting point of at least 40° C., (b) a degree of unsaturation of between 1 and 5 moles unsaturation per 1000 grams polyester and (c) a viscosity in the melt at 120° C. of at least 1 dPa.s.

Claim 12

Process according to claim 9, wherein said crystalline polyester has a melting point of at least 50° C.

Claim 13

Process according to claim 9, wherein said crystalline polyester has a melting point of at least 70° C.

Claim 14

Process according to claim 9, wherein said crystalline polyester has a degree of unsaturation of between 2.0 and 3.75 moles/1000 g.

Claim 15

Process according to claim 9, wherein said crystalline polyester has a viscosity in the melt at 120° C. of at least 15 dPa.s.

Claim 16

Process according to claim 9, wherein said crystalline polyester is composed of at least 80% by weight of units derived from fumaric acid, symmetric aliphatic dicarboxylic acids containing 2 to 12 carbon atoms, and symmetric aliphatic diols containing from 2 to 12 carbon atoms.

Claim 17

Process according to claim 9, wherein said coating agent includes polymerizable components consisting of at least 85% by weight of one or more crystalline unsaturated polyesters having a melting point of at least 70° C., a degree of unsaturation of between 2.0 and 3.75/1000 g and a viscosity in the melt at 120° C. of at least 15 dPa.s.

Claim 18

Process according to claim 15, wherein said crystalline polyester is composed of at least 80% by weight of units derived from fumaric acid, symmetric aliphatic dicarboxylic acids containing 2 to 12 carbon atoms and symmetric aliphatic diols containing from 2 to 12 carbon atoms.