Composition for filling, patching and the like

Claim 2

A CURED, UNFOAMED COMPOSITION WHICH, PRIOR TO CURING, HAD A DENSITY OF 0.4 TO 1.2, DISPLAYED A PEAK VISCOSITY OF AT LEAST 25,000 CPS, POSSESSED PARTICULAR UTILITY FOR USE IN FILLING DENTS IN DAMAGED AUTO BODIES IN PREPARATION FOR REPAINTING, AND CONSISTED ESSENTIALLY OF:

Claim 3

APPROXIMATELY 1/3 TO 1/2 BY VOLUME OF A LIQUID RESIN SYSTEM CONSISTING ESSENTIALLY OF A. A MAJOR PORTION OF THERMOSETTABLE UNSATURATED POLYESTER RESIN, B. A MINOR PORTION OF LIQUID ORGANIC MONOMER WHICH IS A SOLVENT FOR SAID POLYESTER RESIN AND REACTIVE THEREWITH, AND C. 1/4 TO 10% BY WEIGHT, BASED ON THE TOTAL WEIGHT OF (A) + (B), OF AT LEAST ONE MIXED ESTER OF CELLULOSE WHICH IS SOLUBLE IN SAID POLYESTER RESIN AND WHICH IS SELECTED FROM THE CLASS CONSISTING OF CELLULOSE ACETATE BUTYRATE AND CELLULOSE ACETATE PROPIONATE,

Claim 4

APPROXIMATELY 1/3 TO 1/2 BY VOLUME OF A LIQUID RESIN SYSTEM CONSISTING ESSENTIALLY OF A. A MAJOR PORTION OF THERMOSETTABLE UNSATURATED POLYESTER RESIN, B. A MINOR PORTION OF LIQUID ORGANIC MONOMER WHICH IS A SOLVENT FOR SAID POLYESTER RESIN AND REACTIVE THEREWITH, AND C. 1/4 TO 10% BY WEIGHT, BASED ON THE TOTAL WEIGHT OF (A) + (B), OF AT LEAST ONE MIXED ESTER OF CELLULOSE WHICH IS SOLUBLE IN SAID POLYESTER RESIN AND WHICH IS SELECTED FROM THE CLASS CONSISTING OF CELLULOSE ACETATE BUTYRATE AND CELLULOSE ACETATE PROPIONATE,

Claim 5

CORRESPONDINGLY APPROXIMATELY 2/3 TO 1/2 BY VOLUME OF A PARTICLUATE FILLER SYSTEM CONSISTING ESSENTIALLY OF, ON A VOLUME BASIS, A. A MAJOR PORTION OF PARTICLES SELECTED FROM THE CLASS CONSISTING OF INORGANIC AND SYNTHETIC RESINOUS HOLLOW MICROSPHERES HAVING AN AVERAGE DENSITY OF 0.03 - 0.6 AND A MEAN DIAMETER OF LESS THAN 150 MICRONS, SUBSTANTIALLY ALL OF SAID PARTICLES HAVING A DIAMETER BELOW 200 MICRONS, AND B. A MINOR PORTION OF SOLID PARTICULATE INORGANIC FILLER HAVING AN AVERAGE PARTICLE SIZE OF LESS THAN 50 MICRONS AND A DENSITY OF LESS THAN 4, AND 3. 0 TO 1.0% BY WEIGHT, BASED ON THE TOTAL COMPOSITION, OF AN ALKYLENE SILANE, SAID COMPOSITION, PRIOR TO CURING BEING SMOOTHLY SPREADABLE, SELF-LEVELING, AND AFTER CURING BEING READILY ABRADABLE TO PROVIDE A SURFACE WHICH DOES NOT DISPLAY POCKMARKS OR BLEMISHES WHEN SUBSEQUENTLY PAINTED.

Claim 6

CORRESPONDINGLY APPROXIMATELY 2/3 TO 1/2 BY VOLUME OF A PARTICLUATE FILLER SYSTEM CONSISTING ESSENTIALLY OF, ON A VOLUME BASIS, A. A MAJOR PORTION OF PARTICLES SELECTED FROM THE CLASS CONSISTING OF INORGANIC AND SYNTHETIC RESINOUS HOLLOW MICROSPHERES HAVING AN AVERAGE DENSITY OF 0.03 - 0.6 AND A MEAN DIAMETER OF LESS THAN 150 MICRONS, SUBSTANTIALLY ALL OF SAID PARTICLES HAVING A DIAMETER BELOW 200 MICRONS, AND B. A MINOR PORTION OF SOLID PARTICULATE INORGANIC FILLER HAVING AN AVERAGE PARTICLE SIZE OF LESS THAN 50 MICRONS AND A DENSITY OF LESS THAN 4, AND 3. 0 TO 1.0% BY WEIGHT, BASED ON THE TOTAL COMPOSITION, OF AN ALKYLENE SILANE, SAID COMPOSITION, PRIOR TO CURING BEING SMOOTHLY SPREADABLE, SELF-LEVELING, AND AFTER CURING BEING READILY ABRADABLE TO PROVIDE A SURFACE WHICH DOES NOT DISPLAY POCKMARKS OR BLEMISHES WHEN SUBSEQUENTLY PAINTED.

Claim 7

correspondingly approximately 2/3 to 1/2 by volume of a particulate filler system consisting essentially of, on a volume basis, a. a major portion of particles selected from the class consisting of inorganic and synthetic resinous hollow microspheres having an average density of 0.03 - 0.6 and a mean diameter of less than 150 microns, substantially all of said particles having a diameter below 200 microns, and b. a minor portion of solid particulate inorganic filler having an average particle size of less than 50 microns and a density of less than 4, and

Claim 8

correspondingly approximately 2/3 to 1/2 by volume of a particulate filler system consisting essentially of, on a volume basis, a. a major portion of particles selected from the class consisting of inorganic and synthetic resinous hollow microspheres having an average density of 0.03 - 0.6 and a mean diameter of less than 150 microns, substantially all of said particles having a diameter below 200 microns, and b. a minor portion of solid particulate inorganic filler having an average particle size of less than 50 microns and a density of less than 4, and

Claim 9

The composition of claim 1 wherein the hollow filler particles are glass microspheres having an average density of 0.1 - 0.4, a calculated average diameter of no more than 100 microns, and constitute about 50% of the volume of said composition.

Claim 10

The composition of claim 2 wherein the mixed cellulose ester constitutes about 1/2 -3% by weight of the resin system.

Claim 11

0 to 1.0% by weight, based on the total composition, of an alkylene silane, said composition, prior to curing being smoothly spreadable, self-leveling, and after curing being readily abradable to provide a surface which does not display pockmarks or blemishes when subsequently painted.

Claim 12

0 to 1.0% by weight, based on the total composition, of an alkylene silane, said composition, prior to curing being smoothly spreadable, self-leveling, and after curing being readily abradable to provide a surface which does not display pockmarks or blemishes when subsequently painted.

Claim 13

In a composition which, prior to curing, possessed utility for repairing dents in automobile bodies and consisted essentially of a cured, unfoamed foaming liquid thermosettable unsaturated polyester resin having distributed throughout solid inorganic filler particles having an average particle size of less than 50 microns, the improvement which consists essentially of incorporating is said composition prior to curing at least 20% by volume, based on the total composition, of filler particles selected from the class consisting of inorganic and synthetic resinous hollow microspheres having an average density of less than 0.6, the total of said filler particles constituting about 1/2 - 2/3 the volume of said composition; and further incorporating in said composition at least 1/4 %, based on resin system solids, of a mixed ester of cellulose which is soluble in said polyester resin system and which is selected from the class consisting of cellulose acetate butyrate and cellulose acetate propionate, whereby the uncured composition is rendered light weight, storage-stable, easily spreadable, self-leveling and, when cured, abradable to expose a surface which does not display pockmarks or blemishes when painted.

Claim 14

In a composition which, prior to curing, possessed utility for repairing dents in automobile bodies and consisted essentially of a cured, unfoamed foaming liquid thermosettable unsaturated polyester resin having distributed throughout solid inorganic filler particles having an average particle size of less than 50 microns, the improvement which consists essentially of incorporating is said composition prior to curing at least 20% by volume, based on the total composition, of filler particles selected from the class consisting of inorganic and synthetic resinous hollow microspheres having an average density of less than 0.6, the total of said filler particles constituting about 1/2 - 2/3 the volume of said composition; and further incorporating in said composition at least 1/4 %, based on resin system solids, of a mixed ester of cellulose which is soluble in said polyester resin system and which is selected from the class consisting of cellulose acetate butyrate and cellulose acetate propionate, whereby the uncured composition is rendered light weight, storage-stable, easily spreadable, self-leveling and, when cured, abradable to expose a surface which does not display pockmarks or blemishes when painted.