Method for preparing a spherical cured polymer or a composition thereof containing linear organopolysiloxane blocks

• US 4,594,134 A
• Filed: 11/09/1984
• Issued: 06/10/1986
• Est. Priority Date: 10/12/1982
• Status: Expired due to Term

• Current Assignee: Ltd. Toray Silicone Company
• Original Assignee: Ltd. Toray Silicone Company
• Inventors: Morita, Yoshitsugu, Hanada, Tsuneo
• Primary Examiner(s): Marquis, Melvyn I.
• Application Number:
  US06/670,369
• Time in Patent Office: 578 Days
• Field of Search: 525/476, 525/446, 525/100, 204/159.13, 528/24, 528/34, 528/901, 528/15, 528/17, 528/18
• US Class Current: 522/99
• CPC Class Codes: C08G 77/42 Block-or graft-polymers containing polysiloxane sequences polymerising aliphatic unsaturated monomers on to a polysiloxane C08F283/12
• CPC Class Codes: C08G 77/70 Siloxanes defined by use of the MDTQ nomenclature
• CPC Class Codes: C08J 2383/00 Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
• CPC Class Codes: C08J 3/12 Powdering or granulating
• CPC Class Codes: C08L 63/00 Compositions of epoxy resins; Compositions of derivatives of epoxy resins
• CPC Class Codes: C08L 83/00 Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 83/04 Polysiloxanes
• CPC Class Codes: C08L 83/10 Block- or graft-copolymers containing polysiloxane sequences obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C08L51/08, C08L53/00
• CPC Class Codes: Y10S 528/901 Room temperature curable silicon-containing polymer

Abstract

Provided is a method for preparing a spherical cured product having a diameter of 5 mm or less of a polymer or a polymer composition containing at least 10 wt % of the linear organopolysiloxane blocks represented by the following general formula (1), characterized by curing in an atomized state a curable polymer or a curable polymer composition containing at least 10 wt % of the linear organopolysiloxane blocks represented by the following general formula (1):

--R.sub.2 SiO].sub.n                                       (1)

wherein R'"'"'s are the same or different monovalent hydrocarbon groups and n is an integer of 5 or more.

Claims

1. A method for preparing a spherical cured product having a diameter of 5 mm or less comprising curing, in an atomized state, a curable material selected from the group consisting of a curable polymer containing at least 10 weight percent of linear organopolysiloxane blocks having the structural formula

View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)

2. A method as set forth in claim 1, wherein the curable organopolysiloxane is organopolysiloxane heat curable.

3. A method as set forth in claim 1 wherein said curable polymer is a curable organopolysiloxane and said curable organopolysiloxane composition is a curable organopolysiloxane composition.

4. A method as set forth in claim 3 wherein the curing reaction is a reaction selected from the group consisting of hydrosilylation, dehydration, deoximation and radical reaction by an organic peroxide.

5. A method as set forth in claim 3 wherein the curable organopolysiloxane is cured using irradiation with high-energy rays.

6. A method as set forth in claim 5, wherein the high-energy rays are ultraviolet rays.

7. A method as set forth in claim 1 wherein the curable polymer is a curable organopolysiloxane/organic resin block copolymer.

8. A method as set forth in claim 7, wherein the organic resin is an epoxy resin.

9. A method as set forth in claim 8 wherein the organopolysiloxane/epoxy resin is cured by a ring-opening addition of said epoxy resin.

10. A method as set forth in claim 1 wherein the curable material is atomized after being dissolved or dispersed in a liquid medium.

11. A method as set forth in claim 1 wherein the curable polymer is a mixture of said organopolysiloxane and a monomer, oligomer or polymer of an organic resin, said polymer characterized by curing while copolymerizing to form a block copolymer.