Nova Patents
BRPI0809816A2

Antifouling coating composition based on curable polyorganosiloxane polyoxyalkylene copolymers

Abstract

A process to physically deter fouling from a substrate in an aquatic fouling environment, which process comprises forming on the substrate, before exposure to the said environment, a coating composition comprising (i) a curable polyorganosiloxane polyoxyalkylene block copolymer having at least two reactive groups X situated on the copolymer chain and (ii) an organosilicon crosslinking agent and/or a catalyst.

Term

No projected expiry on record.

  1. Priority
  2. Filed
  3. Granted
  4. Today

1 claim: 1 independent, 0 dependent

  1. 1
    (86) Pedido Internacional:pct EP2008055130 de 28/04/2008 (87) Publicação Internacional: wo 2oos/i32i96de 06/11/2008 Translation of claims of equivalent WO 2008132196 A1 CLAIMS 1. A process to physically deter fouling from a substrate in an aquatic fouling environment, which process comprises forming on the substrate, before exposure to the said environment, a coating composition comprising (i) a curable polyorganosiloxane polyoxyalkylene block copolymer having at least two reactive groups X situated on the copolymer chain and (ii) an organosilicon crosslinking agent and/or a catalyst. Retificada a publicação 1.3 da RPI 2283 em relação ao item 22. 2. A process according to claim 1 wherein said groups X are reactive with each other and wherein the coating composition comprises a catalyst and optionally a crosslinking agent. 3. A process according to claim 1 wherein said groups X are not reactive with each other and wherein the coating composition comprises an organosilicon crosslinking agent having at least two groups Y reactive with the said groups X. 4. A process according to claim 3 wherein the polyorganosiloxane polyoxy- alkylene block copolymer has two reactive groups X on a polyorganosiloxane block per molecule and wherein the organosilicon crosslinking agent has on average more than two reactive groups Y per molecule. 5. A process according to any one of the preceding claims wherein the polyorganosiloxane polyoxyalkylene block copolymer is a block copolymer of the form PS - (A - PO - A - PS)n, wherein PS represents a polyorganosiloxane block, PO represents a polyoxyalkylene block, A represents a divalent moiety, and n has a value of at least 1. 6. A process according to any one of claims 3-5 wherein the reactive groups X are Si-H groups and the crosslinking agent contains ethylenically unsaturated groups Y. 7. A process according to claim 6 wherein the coating composition contains a catalyst comprising a platinum group metal and is packaged in two containers, so that the polyorganosiloxane polyoxyalkylene block copolymer, the crosslinking agent, and the catalyst are not all together in the same package. 8. A process according to any one of claims 1 -5 wherein the reactive groups X are Si-alkoxy groups which are reactive with each other and if an organosilicon crosslinking agent is present, the reactive groups Y are also Si- alkoxy groups. 9. A process according to claim 8 wherein the reactive groups X are of the formula -Si(R')2(OR), wherein R represents an alkyl group having 1 to 4 carbon atoms and each R' represents an alkyl group having 1 to 6 carbon atoms, a phenyl group, or an alkoxy group of the formula -OR. 10. A process according to claim 8 or 9 wherein the composition contains a siloxane condensation catalyst and the composition is packed in a moisture- proof container. 11. A process according to any one of claims 8-10 wherein each PS block is a polydimethylsiloxane block. 12. A process according to any one of claims 1 -5 wherein the reactive groups X are Si-alkoxy groups which are reactive with each other and if an organo- silicon crosslinking agent is present, the reactive groups Y are silanol groups. 13. A process according to any one of claims 1 -5 wherein the reactive groups X are silanol groups which are reactive with each other and if an organosilicon crosslinking agent is present, the reactive groups Y are selected from alkoxy, acetoxy, ketoxime, amide or hydroxyl groups bonded to silicon. 14. A substrate coated with a coating obtainable by a) applying on the surface a coating composition comprising (i) a curable polyorganosiloxane polyoxyalkylene block copolymer having at least two reactive groups X situated on the copolymer and (ii) an organosilicon crosslinking agent and/or a catalyst and b) subsequently curing the coating composition. 15. A substrate according to claim 15 wherein the substrate is an underwater structure.