Process for preparing polyurethane-backed substrates, and the substrates so produced

• Main Authors: TURNER, ROBERT B, SKAGGS, KENNETH W, LAMB, TERRY L
• Format: Patent
• Language: English; French; German
• Published: 22.06.1994
• Edition: 5
• Subjects: CHEMISTRY; COFFEE MILLS; COMPOSITIONS BASED THEREON; DOMESTIC ARTICLES OR APPLIANCES; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR; FURNITURE; HOUSEHOLD OR TABLE EQUIPMENT; HUMAN NECESSITIES; LAUNDERING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SPICE MILLS; SUCTION CLEANERS IN GENERAL; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; TREATMENT OF TEXTILES OR THE LIKE; WALL, FLOOR OR LIKE COVERING MATERIALS, e.g. LINOLEUM,OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF AFIBROUS WEB COATED WITH A LAYER OF MACROMOLECULARMATERIAL

Substrates having successive layers of a cellular polyurethane and a non-cellular polyurethane are prepared using certain siloxane-polyether block copolymers in the non-cellular polyurethane formulation. Said block copolymers contain 10 to 30 weight percent dialkylsiloxane units, 30 to 70 weight percent oxyethylene units and, optionally, up to 55 weight percent other oxyalkylene units. The use of the block copolymer reduces or eliminates the formation of a bubble line at the interface of the polyurethane layers, thereby improving physical and cosmetic properties of the carpet.