Browse Prior Art Database

Color durability and saturation in plastics

IP.com Disclosure Number: IPCOM000005232D
Publication Date: 2001-Aug-17
Document File: 2 page(s) / 24K

Publishing Venue

The IP.com Prior Art Database

Abstract

Color durability and saturation are attributes often difficult to simultaneously achieve in plastics. Many engineered thermoplastic resin applications require pigments capable of providing both excellent durability and high chroma. However, many chromatic colorants exhibit poor lightfastness and thermal stability. A relatively new family of inorganic pigments based on cerium sulfide achieves these conditions and more. Cerium sulfide pigments are lightfast, chromatic, heat stable. In addition, cerium sulfide pigments do not negatively influence physical properties of the polymer. Cerium sulfide pigments have been successfully used in many thermoplastics such as polyolefins, nylon, and polycarbonate.

This text was extracted from a WORD97 document.
This is the abbreviated version, containing approximately 73% of the total text.

Title: Color durability and saturation in plastics

Abstract:

Color durability and saturation are attributes often difficult to simultaneously achieve in plastics. Many engineered thermoplastic resin applications require pigments capable of providing both excellent durability and high chroma. However, many chromatic colorants exhibit poor lightfastness and thermal stability. A relatively new family of inorganic pigments based on cerium sulfide achieves these conditions and more. Cerium sulfide pigments are lightfast, chromatic, heat stable. In addition, cerium sulfide pigments do not negatively influence physical properties of the polymer. Cerium sulfide pigments have been successfully used in many thermoplastics such as polyolefins, nylon, and polycarbonate.

Article

Color durability and saturation are attributes often difficult to simultaneously achieve in plastics. Many engineered thermoplastic resin applications require pigments capable of providing both excellent durability and high chroma. However, many chromatic colorants exhibit poor lightfastness and thermal stability. A relatively new family of inorganic pigments based on cerium sulfide achieves these conditions and more. Cerium sulfide pigments are lightfast, chromatic, heat stable. In addition, cerium sulfide pigments do not negatively influence physical properties of the polymer. Cerium sulfide pigments have been successfully used in many thermoplastics such as polyolefins, nylon, and polycarbonate.

While cerium sulfide pigments are ideally suited for outdoor applications, problems in chemical stability may arise upon incorporation into acid-quenched blends of polycarbonate and polyester. Such blends are used in automotive and OVAD applications and provide chemical resistance, durability, good flow, and excellent impact.

Exposure of sulfide-based pigments to acid while blending and compounding may lead to a reaction wherein hydrogen sulfide gas is released. The presence of hydrogen sulfide typically does not present a problem during injection molding, however, blending, compounding, and packaging can lead to build up of hydrogen sulfide and compromise operator health and safety.

This paper describes a strategy which may result in a finished product with curtailed hydrogen sulfide emissions. Encapsulation of pigment particles with a polymerized coating could serve to limit the extent of physical contact between reactive pigment and acid.

Wim van Ooij of University of Cincinnati has extensively investigated plasma coating of pigments. It is proposed in this paper that methods discovered by Ooij et al be translated to sulfide-based pigments. Briefly, plasma-coating technology involves the introduction of a reactive monomer, such as pyrrole, into a plasma reactor. The finished pigment is likely comprised of the primary particle, agglomerates, a polymeric coating encapsulating the pigment, and some resid...