| 主权项 |
1. A coated pipe comprising:
a pipe comprising an interior surface and an exterior surface; and a coating in contact with the exterior surface of the pipe, the coating comprising:
a hot melt processable siloxane-based elastomeric polymer, wherein the siloxane-based elastomeric polymer comprises a segmented copolymer of Formula 1 or Formula 2: wherein each R is a moiety that, independently, is an alkyl moiety, having about 1 to 12 carbon atoms, and may be substituted with, for example, trifluoroalkyl or vinyl groups, a vinyl radical or a higher alkenyl radical, a cycloalkyl moiety having from about 6 to 12 carbon atoms and may be substituted with alkyl, fluoroalkyl, and vinyl groups, or an aryl moiety havingfrom about 6 to 20 carbon atoms and may be substituted;each Z is a polyvalent radical that is an arylene radical or an aralkylene radicalhaving from about 6 to 20 carbon atoms, an alkylene or cycloalkylene radicalhaving from about 6 to 20 carbon atoms;each Y is a polyvalent radical that independently is an alkylene radical of 1 to10 carbon atoms, an aralkylene radical or an arylene radical having 6 to 20 carbon atoms;each D is selected from the group consisting of hydrogen, an alkyl radical of 1to 10 carbon atoms, phenyl, and a radical that completes a ring structure including B or Y to form a heterocycle;where B is a polyvalent radical selected from the group consisting of alkylene,aralkylene, cycloalkylene, phenylene, heteroalkylene, and copolymers and mixtures thereof;m is a number that is 0 to about 1000;n is a number that is at least 1; andp is a number that is at least 10, in some embodiments 15 to about 2000, or even 30 to 1500; wherein each R1 is independently an alkyl, haloalkyl, aralkyl, alkenyl, aryl, oraryl substituted with an alkyl, alkoxy, or halo;each Y is independently an alkylene, aralkylene, or a combination thereof;subscript a is independently an integer of 40 to 1500;subscript b is an integer of 1 to 10;G is a divalent group that is the residue unit that is equal to a diamine of formula R3HN-G-NHR3 minus the two —NHR3 groups;each R3 is hydrogen or an alkyl having 1 to 10 carbon atoms, or R3 taken together with G and with the nitrogen to which they are both attached forms aheterocyclic group;each asterisk (*) indicates a site of attachment of the repeat unit to another group in the copolymer; and wherein the coating is non-tacky and non-adhesive to polar substrates at a temperature of less than 50° C. and is adhesive to polar substrates at a temperature of greater than 50° C. up to a temperature of 10° C. below the decomposition temperature of the siloxane-based elastomeric polymer. |
