Micro-powdery stain composition for unsaturated polyester resin, unsaturated polyester resin composition and production process therefor

An unsaturated polyester resin composition, comprising:

• a) an unsaturated polyester resin;
• b) either or both of a pigment and an oil-soluble dye;
• and
• c) wherein the composition further comprises at least one resin selected from the group consisting of low molecular polystyrene having a number-average molecular weight from 1000 to 10,000, low molecular acrylstyrene having a number-average molecular weight from 1000 to 10,000 and low molecular acryl having a number-average molecular weight from 1000 to 10,000.

A production process for an unsaturated polyester resin composition comprising the steps of:

• a) providing an unsaturated polyester resin;
• b) providing a micro-powdery stain composition wherein the micro-powdery stain composition comprises:
• i) either or both of a pigment and an oil-soluble dye;
• and
• ii) at least one resin selected from the group consisting of polystyrene having a number-average molecular weight from 60,000 to 200,000 low molecular polystyrene having a number-average molecular weight from 1000 to 10,000, low molecular acrylstyrene having a number-average molecular weight from 1000 to 10,000 and low molecular acryl having a number-average molecular weight from 1000 to 10,000;
• and
• c) mixing the unsaturated polyester resin with the micro-powdery stain composition to obtain the unsaturated polyester resin composition.

A micro-powdery stain composition for an unsaturated polyester resin, comprising:

• a) a coloring agent;
• b) a resin, wherein the resin is soluble in styrene, wherein the resin is soluble in unsaturated polyester resin, wherein the resin is still further a low-shrinkage agent for unsaturated polyester resin, and wherein the resin is in a form of micro-powdery stain particles;
• c) wherein an amount of said resin is in a range of 80 to 500 weight parts per 100 weight parts of the coloring agent;
• d) wherein the micro-powdery stain particles have an average particle diameter of 900 microns or less;
• and
• e) wherein the micro-powdery stain particles include the coloring agent to obtain the micro-powdery stain composition to be mixed into the unsaturated polyester resin.

An unsaturated polyester resin composition, comprising:

• a) an unsaturated polyester resin;
• b) a coloring agent;
• c) at least one further resin, wherein said further resin is soluble in styrene, wherein said further resin is soluble in unsaturated polyester resin, wherein said further resin is still further a low-shrinkage agent for unsaturated polyester resin, and wherein said further resin is in a form of micro-powdery stain particles;
• d) wherein an amount of said further resin is in a range of 80 to 500 weight parts per 100 weight parts of the coloring agent;
• e) wherein the micro-powdery stain particles have an average particle diameter of 900 microns or less;
• f) wherein the micro-powdery stain particles include the coloring agent;
• and
• g) wherein an amount of the micro-powdery stain particles is in a range of 25 weight parts or below per 100 weight parts of the unsaturated polyester resin.

A production process for an unsaturated polyester resin composition comprising the steps of:

• a) providing an unsaturated polyester resin;
• b) providing a micro-powdery stain composition, with the micro-powdery stain composition comprising:
• i) a coloring agent;
• ii) at least one further resin, wherein said further resin is soluble in styrene, wherein said further resin is soluble in unsaturated polyester resin, wherein said further resin is still further a low-shrinkage agent for unsaturated polyester resin, and wherein said further resin is in a form of micro-powdery stain particles;
• iii) wherein an amount of said further resin is in a range of 80 to 500 weight parts per 100 weight parts of the coloring agent;
• iv) wherein the micro-powdery stain particles have an average particle diameter of 900 microns or less;
• v) wherein the micro-powdery stain particles include the coloring agent;
• and
• vi) wherein an amount of the micro-powdery stain particles is in a range of 25 weight parts or below per 100 weight parts of the unsaturated polyester resin;
• and
• c) mixing the unsaturated polyester resin with the micro-powdery stain composition to obtain the unsaturated polyester resin composition.