processo contínuo para produzir uma dispersão aquosa de poliuretano de conteúdo ultra-elevado de sólidos e método para produzir um artigo

• Main Authors: DEBKUMAR BHATTACHARJEE, Bedri Erdem
• Format: Patent
• Language: Portuguese
• Published: 13.11.2018
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; DYES; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS AS ADHESIVES; WORKING-UP

The instant invention is an ultra-high solid content polyurethane dispersion, and a continuous process for producing ultra-high solid content polyurethane dispersions. The ultra-high solid content polyurethane dispersion includes the reaction product of: (1) a first component, wherein the first component is a first polyurethane prepolymer or a first polyurethane prepolymer emulsion; (2) a second component, wherein the second component is a second polyurethane prepolymer, a second polyurethane prepolymer emulsion, a low solid content polyurethane dispersion, a seed latex, or combinations thereof; (3) and a chain extender. The ultra-high solid content polyurethane dispersion has a solid content of at least 60 percent by weight of the solid, based on the total weight of the ultra-high solid content polyurethane dispersion, and a viscosity in the range of less than 5000 cps at 20 rpm at 21° C. using spindle #4 with Brookfield viscometer. The method for producing a high-solid content polyurethane dispersion includes the following steps: (1) providing a first stream, wherein said first stream comprising a first polyurethane prepolymer or a first polyurethane prepolymer emulsion; (2) providing a second stream, wherein said second stream being a media phase selected from the group consisting of a second polyurethane prepolymer, a second polyurethane prepolymer emulsion, a polyurethane prepolymer dispersion, a seed latex emulsion, or combinations thereof; (3) continuously merging said first stream with said second stream in the presence of a chain extender; and (4) thereby forming a polyurethane dispersion having a solid content of at least 60 percent by weight of the solid, based on the total weight of the ultra-high solid content polyurethane dispersion, and a viscosity in the range of less than 5000 cps at 20 rpm at 21° C. using spindle #4 with Brookfield viscometer.