Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1994-05-23
1997-01-14
Glass, Margaret W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524731, 526279, 525477, 525479, C08J 324
Patent
active
055940676
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method of manufacturing a water-based silicone-type graft copolymer emulsion, and more particularly to a water-based emulsion for use in a variety of fields, such as paint resins, agents for processing paper, fiber and film, civil engineering resins, adhesives and tackifiers.
BACKGROUND ART
Hitherto, methods of manufacturing a silicone-type graft copolymer have been categorized into methods in which active groups are formed by drawing hydrogen from lower alkyl groups bonded to silicon atoms of the silicone and then organic polymers are grafted to the active groups, and a method in which silicone having the active groups is previously manufactured and then the organic polymers are grafted to the active groups.
In the former case, hydrogen must be drawn from silicone, and therefore suitable methods and conditions must be employed. For example, the ability for drawing hydrogen, the grafting efficiency and the molecular weight of the organic polymer grafted to the organic peroxide are affected by the type and the quantity of the organic peroxide and the reaction temperature. However, it is difficult to adequately control the foregoing factors.
In the latter case, silicone having active groups and living polymers obtainable from anion polymerization are allowed to react with each other so that the silicone type graft copolymer can be obtained. However, due to excessive complication of the structure using the anion polymerization, unsatisfactory range in selecting the polymerizable monomer for use in the anion polymerization, high manufacturing cost and difficulty involved in the operation the latter method has been unsatisfactory as a commercial manufacturing method.
On the other hand, a method (hereinafter referred to as a "macromonomer method"), in which high-molecular monomers each having polymerizable functional groups, such as double bonds, are copolymerized with other copolymer monomers and which is able to manufacture the graft polymers, has attracted attention. In this case, the foregoing method has generally been performed by means of solution polymerization in which both high-molecular monomers and monomers to be copolymerized with the high-molecular monomers are dissolved in an organic solvent and they are polymerized or by means of suspension polymerization caused to proceed in a water-based solvent. However, the solution-type graft polymer cannot satisfy the needs of the times to prevent pollution and save resources, while the graft polymer obtainable from the suspension polymerization encounters phase separation into a liquid phase and a solid phase, making it difficult to use in liquid form as a water-based dispersion. Therefore, an emulsion type graft polymer, which can be used in place of the foregoing graft polymer and which is composed of emulsified dispersions each having a small particle size, has been earnestly sought. Although there are only a few methods for manufacturing the graft polymer by means of the macromonomer method in which the water-based emulsification polymerization is performed, there are the following proposals.
For example, Japanese Patent Laid-Open No. 3-163103 has suggested a method for manufacturing a graft polymer emulsion comprising the steps of: dissolving high-molecular monomers each having radical polymerizable functional groups and an oil soluble radical polymerization initiator in another vinyl monomer which is copolymerizable with the high-molecular monomer; emulsifying and dispersing, in a water-based medium, the obtained solution under the presence of an emulsifier composed of an alkali metal sulfosuccinate or another sulfonic acid or alkali metallic salt sulfate type anion surface active agent and a nonion surface active agent having an HLB value of 10 or more; and raising the temperature to copolymerize the high-molecular monomers and the other vinyl monomers.
However, the foregoing method requires that the high-molecular monomer and another copolymerizable monomer, which is copolymerized with the high-molecul
REFERENCES:
patent: 4261875 (1981-04-01), LeBoeuf
patent: 4962165 (1990-10-01), Bortnick et al.
patent: 4987178 (1991-01-01), Shibata et al.
Doi Yukio
Kinugasa Masayoshi
Zhang Wei-Zhong
Glass Margaret W.
Showa Highpolymer Co. Ltd.
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