Microspheres of melamine

• US 6,291,632 B1
• Filed: 06/19/2000
• Issued: 09/18/2001
• Est. Priority Date: 12/10/1998
• Status: Expired due to Fees

• Current Assignee: Grantec ( Xiamen ) Co., Ltd.
• Original Assignee: Grantec ( Xiamen ) Co., Ltd.
• Inventors: Evert, Scott
• Primary Examiner(s): Truong, Duc
• Application Number:
  US09/597,323
• Time in Patent Office: 456 Days
• Field of Search: 528/254, 528/236
• US Class Current: 528/254
• CPC Class Codes: A61K 2800/412 Microsized, i.e. having sizes between 0.1 and 100 microns
• CPC Class Codes: A61K 8/84 obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
• CPC Class Codes: A61Q 19/00 Preparations for care of the skin
• CPC Class Codes: C08G 12/32 Melamines
• CPC Class Codes: C08L 61/28 with melamine

Abstract

Microspheres of polymerized melamine formaldehyde resin in spherical form with the microspheres having particle size in a range of 5-15 microns, with the microshperes exhibiting a low coefficient of friction, and providing silky smoothness and opacity when added to other formulations such as cosmetics.

Claims

1. Microspheres of polymerized melamine formaldehyde resin in spherical form with the microspheres having particle size in a range of 5-15 microns.

2. Microspheres of polymerized melamine formaldehyde resin in spherical form with the microspheres having particle size in a range of 5-15 microns and a coefficient of friction lower than the coefficient for talc.

3. Microspheres of polymerized melamine formaldehyde resin in spherical form with the microspheres having a coefficient of friction approximately one-quarter of the coefficient of friction for talc.

4. Microspheres of polymerized melamine formaldehyde resin in spherical form with the microspheres having a coefficient of friction of approximately 0.1 using the ASTM D1884-95 test method.

5. Microspheres of polymerized melamine formaldehyde resin as defined in claim 4 in which the microspheres have a particle size in a range of 5-15 microns.

6. A cosmetic formulation containing microspheres of polymerized melamine formaldehyde resin in spherical form with the microspheres having particle size in a range of 5-15 microns for imparting smoothness to the formulation.

7. A cosmetic formulation containing microspheres of polymerized melamine formaldehyde resin in spherical form with the microspheres having particle size in a range of 5-15 microns for imparting opacity to the formulation.

8. Microspheres of polymerized melamine formaldehyde resin which are perfectly spherical in form with the microspheres having particle size in a range of 5-15 microns, and a coefficient of friction less than talc.