# US 5,705,541 A · High gloss molded articles of curable epoxy resin composition comprising fillers

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- Number: US 5,705,541 A
- Document ID: US5705541A
- Status: Granted
- Kind: A
- Application number: 08/647,077
- Filed: 1996-05-08
- Granted: 1998-01-06
- Earliest claimed: 1993-07-09
- Assignees: Ciba Specialty Chemicals Corporation
- Inventors: Jens Awe; Helmut Beer; Wilhelm Endlich
- Web page: https://patentgrep.com/patent/US5705541A

## CPC

- C08K 3/34: Silicon-containing compounds
- C08K 3/36: Silica
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Molded articles having a high gloss comprising (a) an epoxy resin having on average more than one epoxide group in the molecule, (b) an epoxy resin curing agent in an amount sufficient for full curing of the epoxy resin, (c) wollastonite having an average particle size of less than 50 .mu.m in an amount of 10 to 350 parts by weight per 100 parts by weight of the sum of components (a) and (b), (d) a quartz/kaolinite mixture having an average particle size of less than 100 .mu.m in an amount of 10 to 350 parts by weight per 50 parts by weight of the sum of components (a) and (b), the content of components (c) and (d) together not being greater than 360 parts by weight, and, if appropriate, (e) customary additives.

## Claims

### Claim 1

A moulded material having a high-gloss surface comprising a cured epoxy resin composition comprising
(a) a solid epoxy resin having on average more than one epoxide group in the molecule,
(b) an epoxy resin curing agent in an amount sufficient for full curing of the epoxy resin,
(c) wollastonite having a weight average particle size of less than 50 .mu.m in an amount of 10 to 350 parts by weight per 100 parts by weight of the sum of components (a) and (b) and,
(d) a quart/kaolinite mixture having a number average particle size of less than 50 .mu.m in an amount of 10 to 350 parts by weight per 100 parts by weight of the sum of components (a) and (b), the content of components (c) and (d) together not being greater than 360 parts by weight.

### Claim 2 (depends on 1)

A moulded article according to claim 1, which comprises a phenolic curing agent for the epoxy resin as component (b).

### Claim 3 (depends on 1)

A moulded article according to claim 1, which comprises a cresol-novolak as component (b).

### Claim 4 (depends on 1)

A moulded article according to claim 1, which comprises wollastonite in an amount of 50 to 200 parts by weight per 100 parts by weight of the sum of components (a) and (b).

### Claim 5 (depends on 1)

A moulded article according to claim 1, which comprises wollastonite having weight average particle size of less than 5 .mu.m.

### Claim 6 (depends on 1)

A moulded article according to claim 1, which comprises a quartz/kaolinite mixture in an amount of 50 to 200 parts by weight per 100 parts by weight of the sum of components (a) and (b).

### Claim 7 (depends on 1)

A moulded article according to claim 1, which comprises a quartz/kaolinite mixture which consists of 5 to 95 parts by weight of quartz and 95 to 5 parts by weight of kaolinite per 100 parts by weight of said mixture.

### Claim 8 (depends on 7)

A moulded article according to claim 7, which comprises a quartz/kaolinite mixture which consists of 20 to 80 parts by weight of quartz and 80 to 20 parts by weight of kaolinite per 100 parts by weight of the mixture.