RUBBER ARTICLE HAVING PROTECTIVE COATING

• Main Authors: ROBERTS, ROBERT, FLEMING, PARKER, DANE, KENTON, PURDON, JAMES, RALPH, JR
• Format: Patent
• Language: English; French
• Published: 14.04.1994
• Edition: 5
• Subjects: ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; CORRECTING FLUIDS; DEVICES OR ARRANGEMENTS RELATED TO TYRES; DYES; FILLING PASTES; GENERAL PROCESSES OF COMPOUNDING; INKS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PERFORMING OPERATIONS; POLISHES; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIESIN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; TYRE CHANGING OR REPAIRING; TYRE INFLATION; USE OF MATERIALS THEREFOR; VEHICLE TYRES; VEHICLES IN GENERAL; WOODSTAINS; WORKING-UP

A polymeric article which is subject to attack by oxygen, ozone and/or ultraviolet light is coated with a thin coating of a polymer (10) which is resistant to oxygen, ozone and UV light. It protects the article from cracking or degradation due to any of these causes. The uncoated article serves as a substrate (12). The substrate (12) may be any polymer which is subject to attack by oxygen, ozone and/or ultraviolet light. A preferred coating (14) is cured from a highly saturated polymer having only a small amount of unsaturation, as for example, hydrogenated nitrile rubber (HNBR, or hydrogenated nitrile/butadiene copolymer), highly saturated styrene/butadiene copolymer, hydrogenated polybutadiene, or hydrogenated styrene/vinylpyridine/butadiene terpolymer. The hydrogenated or highly saturated polymer of the coating is obtained by hydrogenating an unsaturated polymer which is a polymer of 1,3-butadiene (5-100 % by weight) and optionally one or more monoethylenically unsaturated polymers (0-95 % by weight). The cured coatings are typically elastomeric. The coating is applied as an uncured highly saturated polymer latex, which is dried and cured in place on the substrate to yield the desired coated article. The thickness of the coating may be about 0.5 mil (0.0005) up to approximately 10 mils (0.01 inch). Un article polymère pouvant être attaqué par l'oxygène, l'ozone et/ou la lumière ultraviolette, est recouvert d'un mince revêtement d'un polymère (10) résitant à l'oxygène, l'ozone et la lumière ultraviolette. Il protège l'article contre la fissuration ou la détérioration provoquée par ces agents. L'article sans revêtement sert de substrat (12). Le substrat (12) peut se composer de n'importe quel polymère pouvant être attaqué par l'oxygène, l'ozone et/ou la lumière ultraviolette. Un revêtement préféré (14) est durci à partir d'un polymère hautement saturé présentant seulement un faible niveau d'insaturation, tel que, notamment, un caoutchouc nitrile hydrogéné (HNBR, ou copolymère nitrile/butadiène hydrogéne), un copolymère styrène/butadiène hautement saturé, un polybutadiène hydrogène ou un terpolymère styrène/vinylpyridine/butadiène hydrogéné. Le polymère hydrogéné ou hautement saturé du revêtement est obtenu par hydrogénation d'un polymère insaturé qui est un polymère de 1,3-butadiène (5-100 % en poids) et, éventuellement, d'un ou plusieurs polymères monoéthyléniquement insaturés (0-95 % en poids). Les revêtements durcis sont généralement élastomères. Le revêtement est appliqué sous forme d'un latex polymère hautement saturé non durci, qui est séché et durci sur place sur le substrat pour produire l'article à revêtement requis. L'épaisseur du revêtement peut être d'environ 0,5 millième de pouce (0,0005) à environ 10 millième de pouce (0,01 pouces).