Dispersion stabilizer for suspension polymerization, and manufacturing method for vinyl resin

A technology of dispersion stabilizer and suspension polymerization, applied in chemical instruments and methods, transportation and packaging, dissolution, etc., can solve the problems of unsatisfactory performance and unsatisfactory performance, and achieve high polymerization stability, less formation, and excellent operability. Effect

Active Publication Date: 2016-03-30
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, when the degree of saponification and the degree of polymerization of PVA are low, although the above-mentioned required properties of (1) to (2) are exerted to a certain extent, they cannot satisfy the requirement of (4) because they are insoluble in water. required performance
By increasing the degree of saponification, the water solubility is improved, but the required properties of (1) to (2) cannot be met

Method used

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  • Dispersion stabilizer for suspension polymerization, and manufacturing method for vinyl resin
  • Dispersion stabilizer for suspension polymerization, and manufacturing method for vinyl resin
  • Dispersion stabilizer for suspension polymerization, and manufacturing method for vinyl resin

Examples

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Embodiment

[0090] Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples. In the following examples and comparative examples, unless otherwise specified, "parts" and "%" represent "parts by mass" and "% by mass", respectively.

[0091] About the PVA obtained by the following manufacture example, it evaluated by the following method.

[0092] [Viscosity average degree of polymerization of PVA]

[0093] The viscosity-average degree of polymerization of PVA can be calculated as follows: After substantially completely saponifying PVA, it is acetylated to produce a vinyl ester polymer, and is measured based on the intrinsic viscosity of the acetone solution of the vinyl ester polymer, using Nakajima Calculation formula (Akio Nakajima: Polymer Chemistry 6 (1949)) to calculate.

[0094] [Saponification degree of PVA]

[0095] The degree of saponification of PVA was determined by the method described i...

manufacture example 2～12、17～26

[0112] Production examples 2-12, 17-26 (manufacture of PVA (A2-A12, A17-A26))

[0113] The amount of vinyl acetate and methanol added, the type and amount of chain transfer agent having an aliphatic hydrocarbon group used during polymerization, the concentration of addition, the amount of initiator used, the target polymerization rate, and other polymerization conditions, saponification conditions, and aqueous solution concentration The dispersion stabilizer for suspension polymerization shown in Table 2: PVA (A2-A12, A17-A26) was manufactured similarly to the manufacture example 1 except having changed. The production conditions are shown in Table 1, and the types of chain transfer agents used and saponification conditions are shown in Tables 3 and 5, respectively.

manufacture example 13～15

[0114] Manufacturing Examples 13-15 (Manufacturing of PVA (A13-A15))

[0115] In addition to changing the polymerization conditions such as the type of chain transfer agent having an aliphatic hydrocarbon group used during polymerization, its usage amount, addition concentration, and initiator usage amount, the unsaturated monomer for copolymerization is added in advance, and after the start of polymerization The dispersion stabilizer for suspension polymerization shown in Table 2: PVA was produced in the same manner as in Production Example 1, except that the concentration of the unsaturated monomer to be copolymerized was always constant with respect to VAc, and the methanol solution of the unsaturated monomer was continuously added to carry out polymerization. (A13~A15). The production conditions are shown in Table 1, and the types of chain transfer agents used and unsaturated monomers used are shown in Tables 3 and 4, respectively.

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Abstract

Provided is a dispersion stabilizer for suspension polymerization having outstanding handling properties, and when said dispersion stabilizer for suspension polymerization is used in the suspension polymerization of a vinyl compound, even when used in small quantities it is possible to obtain a vinyl resin which has a high absorption of a plasticizer and which is easy to work, the residual monomer component can be removed easily from the resultant vinyl resin, and there is minimal formation of large rough particles in the vinyl resin obtained. The present invention is a water-based dispersion stabilizer for suspension polymerization, containing 20mass% to 50mass% of a PVA having a degree of saponification of 35mol% to 65mol%, a viscosity-average degree of polymerization of 100 to 480, a C6-C12 aliphatic hydrocarbon group on the terminal, and a block character of the residual ester group of at least 0.5. The values for P (viscosity average degree of polymerization of PVA) and S (amount of denaturation of the aliphatic hydrocarbon group) satisfy the following formula: 50 <= S x P / 1.880 <= 100.

Description

technical field [0001] The present invention relates to a dispersion stabilizer for suspension polymerization of vinyl compounds. Moreover, this invention also relates to the manufacturing method of the vinyl-type resin which performs suspension polymerization of a vinyl compound in presence of the dispersion stabilizer for suspension polymerization. Background technique [0002] Conventionally, in order to obtain a vinyl resin from a vinyl compound (for example, vinyl chloride), suspension polymerization of a vinyl compound has been performed. As a dispersion stabilizer for suspension polymerization of a vinyl compound, it is known to use a partially saponified vinyl alcohol polymer (hereinafter, the vinyl alcohol polymer may be abbreviated as PVA). [0003] The properties required for the dispersion stabilizer for suspension polymerization of vinyl compounds include: (1) Even if the amount of the dispersion stabilizer for suspension polymerization used is small, high plas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/20C08F8/12C08F18/04C09K23/00
CPCC08F18/04C08F8/12C08F2/30C08F2/20C09K23/38C08F114/06C08L29/04C08L2201/54
Inventor 福原忠仁熊木洋介
Owner KURARAY CO LTD
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