摘要:
The invention provides a process for grafting silane or silicone functionality onto a polyolefin, comprising reacting the polyolefin with an unsaturated monomer (A) containing an olefinic —C═C— bond or acetylenic —C≡C— bond and a reactive functional group X in the presence of means capable of generating free radical sites in the polyolefin and with an organosilicon compound (B) having a functional group Y which is reactive with the functional group X of the unsaturated monomer (A), characterized in that the unsaturated monomer (A) contains an aromatic ring or a further olefinic double bond or acetylenic unsaturation, the aromatic ring or the further olefinic double bond or acetylenic unsaturation being conjugated with the olefinic —C═C— or acetylenic —C≡C— unsaturation of the unsaturated monomer (A).
摘要:
The invention provides a process for grafting silane or silicone functionality onto a polyolefin, comprising reacting the polyolefin with an unsaturated monomer (A) containing an olefinic —C═C— bond or acetylenic —C≡C— bond and a reactive functional group X in the presence of means capable of generating free radical sites in the polyolefin and with an organosilicon compound (B) having a functional group Y which is reactive with the functional group X of the unsaturated monomer (A), characterized in that the unsaturated monomer (A) contains an aromatic ring or a further olefinic double bond or acetylenic unsaturation, the aromatic ring or the further olefinic double bond or acetylenic unsaturation being conjugated with the olefinic —C═C— or acetylenic —C≡C— unsaturation of the unsaturated monomer (A).
摘要:
A composition containing (A) a compound having at least one aliphatic unsaturation; (B) a cyclic organohydrogen-silicon crosslinking compound containing at least one silicon-bonded hydrogen atom (Sift) per molecule, prepared by a platinum catalyzed coupling reaction of a methylhydrogen cyclosiloxane, with a reactant containing aliphatic unsaturation, hydroxy functionalities, or a mixture of both; and (B1) a linear or branched acyclic organohydrogensilicon Crosslinking compound containing at least one silicon-bonded hydrogen atom per molecule. The composition can be used to prepare release coating compositions by adding (C) a platinum group metal-containing catalyst. Release coating compositions containing Components (B) and (B1) have better cure, better adhesion, and lower release forces, than release coating compositions containing only Component (B).
摘要:
A method is provided for the direct synthesis of novel polymeric materials functionalized with desirable nitrogen-containing functional groups such as terminal azido, cyano, carbonylamino or thiocarbonylamino groups. Polymerization and functionalization occur in a substantially simultaneous manner. All necessary reactants for the functionalization are present when polymerization is initiated. The nitrogen-containing functional group is provided as a part of a molecule having a release moiety which is preferably resonance stabilized or a tertiary alkyl type and which acts to aid the nitrogen-containing species in functioning as a leaving group.
摘要:
A release coating composition is prepared comprising a polyorganosiloxane (A) having alkenyl groups, a crosslinking agent (B) having organohydrogensiloxane groups, a catalyst for the hydrosilylation reaction between (A) and (B), and an anchorage additive for enhancing the adhesion of the composition to a polymer film substrate. The anchorage additive is the reaction product of a fluid polyorganosiloxane (C) containing at least one alkenyl group and at least one silanol group with a hydrolysable silane (D) containing at least one epoxide group. The curable silicone release coating composition can be applied to a substrate known as a ‘liner’ retaining a label, which liner can for example be paper or a polymer film, and cured.
摘要:
A release coating composition is prepared comprising a polyorganosiloxane (A) having alkenyl groups, a crosslinking agent (B) having organohydrogensiloxane groups, a catalyst for the hydrosilylation reaction between (A) and (B), and an anchorage additive for enhancing the adhesion of the composition to a polymer film substrate. The anchorage additive is the reaction product of a fluid polyorganosiloxane (C) containing at least one alkenyl group and at least one silanol group with a hydrolysable silane (D) containing at least one epoxide group. The curable silicone release coating composition can be applied to a substrate known as a ‘liner’ retaining a label, which liner can for example be paper or a polymer film, and cured.
摘要:
A composition containing (A) a compound having at least one aliphatic unsaturation; (B) a cyclic organohydrogen-silicon crosslinking compound containing at least one silicon-bonded hydrogen atom (Sift) per molecule, prepared by a platinum catalyzed coupling reaction of a methylhydrogen cyclosiloxane, with a reactant containing aliphatic unsaturation, hydroxy functionalities, or a mixture of both; and (B1) a linear or branched acyclic organohydrogensilicon Crosslinking compound containing at least one silicon-bonded hydrogen atom per molecule. The composition can be used to prepare release coating compositions by adding (C) a platinum group metal-containing catalyst. Release coating compositions containing Components (B) and (B1) have better cure, better adhesion, and lower release forces, than release coating compositions containing only Component (B).