29-01-2015 дата публикации
Номер: US20150031826A1
Принадлежит:
A process for preparing resin-linear organosiloxane block copolymers is disclosed. The process involves an initial hydrosilylation reaction to link a linear organosiloxane block with a resin organosiloxane portion to form the resin-linear block copolymer. The resulting resin-linear organosiloxane block copolymer is further crosslinked to provide copolymer compositions that are useful as coatings for various electronics and lighting components. 2. The process of claim 1 , wherein the further processing enhances storage stability and/or optical clarity and/or optionally adding to the resin-linear organosiloxane block copolymer from step II) a stabiliser.3. The process of claim 1 , wherein the reaction in step II) comprises a hydrosilylation reaction.4. The process of claim 1 , wherein the resin-linear organosiloxane block copolymer is formed in the presence of a solvent.5. The process of claim 4 , further comprising removing the solvent before or after the further processing.6. The process of claim 1 , wherein component a) has the average formula:{'br': None, 'sub': 3', '2', '3', '2', '2/2', 'n', '3', '2, 'H(CH)SiO[(CH)SiO)]Si(CH)H'}where n may vary from 10 to 400, {'br': None, 'sub': 2', '3', '2', '1/2', 'a', '6', '5', '3/2', 'd', '4/2', 'e, '[(HC═CH)(CH)SiO][(CH)SiO][SiO]'}, 'and component b) has the average formula'}{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'where the subscripts a, d, and e are as defmed in .'}7. The process of claim 1 , wherein component a) has the average formula{'br': None, 'sub': 2', '3', '2', '3', '2', '2/2', 'n', '3', '2', '2, '(HC═CH)(CH)SiO[(CH)SiO)]Si(CH)(HC═CH)'}where n may vary from 10 to 400, {'br': None, 'sub': 3', '2', '1/2', 'a', '4/2', 'e, '[H(CH)SiO][SiO]'}, 'and component b) has the average formula'}{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'where the subscripts a and e are as defmed in .'}8. The process of claim 1 , wherein a crosslinker is added in step II) and/or in step I) claim 1 , where the crosslinker has ...
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