Mold release agent

Details Mold release agent Mold release agent

1994-02-22

1996-06-11

Brunsman, David

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

10628727, 10628724, C09K 300, B28B 736

Patent

active

055251501

DESCRIPTION:

BRIEF SUMMARY
This is a 371 of PCT/JP93/00544.


FIELD OF THE INVENTION

The present invention relates to a mold release agent. Particularly, it relates to a water-based mold release agent used for the preparation of a shaped article of a polymeric material such as a synthetic resin and a rubber.


RELATED ART AND PROBLEMS

Hitherto, an organic solvent-based mold release agent comprising a halogen-containing polyether as a main component is known (cf. Japanese Patent Kokai Publication No. 112610/1986). Although the mold release agent comprising the halogen-containing polyether has good mold releasability, it has the problem that the environment is polluted during the use of it since it contains the organic solvent. It is required to develop a water-based mold release agent comprising a halogen-containing polyether as the main component, which is free from the environmental pollution. The water-based mold release agent comprising the halogen-containing polyether as the main component which is disclosed in Japanese Patent Kokai Publication No. 112610/1986 has the problem that the mold release agent has poor storage stability (namely, the halogen-containing polyether is separated from the mold release agent).


SUMMARY OF THE INVENTION

An object of the present invention is to provide a water-based mold release agent which is free from the environmental pollution problem during its use, which has excellent dispersibility, storage stability and mold releasability and which gives a good surface state to a molded article of a polymeric material.
The present invention provides a water-based mold release agent comprising, as a main component, a halogen-containing polyether having at least one functional group.


DETAILED DESCRIPTION OF THE INVENTION

The mold release agent according to the present invention comprises
The halogen-containing polyether used in the present invention has at least one functional group, and the halogen-containing polyether having no functional group which is described in Japanese Patent Kokai Publication No. 112610/1986 is not preferable in the present invention.
The halogen-containing polyether having at least one functional group may be well-known one and is described in Japanese Patent Kokai Publication No. 131132/1989 (corresponding to U.S. Pat. No. 4,836,944, the disclosure of which is incorporated herein by reference), Japanese Patent Kokai Publication No. 134189/1991, Japanese Patent Kokai Publication No. 268664/1989 (corresponding to U.S. Pat. No. 5,004,544, the disclosure of which is incorporated herein by reference), and Japanese Patent Kokai Publication No. 132917/1991.
A perfluoropolyether having at lease one functional group is preferable. Specific examples of the preferable halogen-containing polyether are ##STR1## m is 1 to 50, n is 1 to 100, p is 0 to 100, q is 0 to 100 and r is 1 to 50.
A perfluoropolyether having a carboxylic acid group or salt thereof is preferable in view of the adherence to a mold surface.
The halogen-containing polyether preferably has an average molecular weight of 1,000 to 5,000, more preferably 1,500 to 3,500.
The surfactant used in the present invention may be any of a hydrocarbon surfactant and a fluorine-containing surfactant. Specific examples of the surfactant are Rapizol B-80 (manufactured by Nippon Oil and Fats Co., Ltd.), Nonion NS 230 (manufactured by Nippon Oil and Fats Co., Ltd.), Nonion NS 220 (manufactured by Nippon Oil and Fats Co., Ltd.), Unidine DS 403 (Daikin Industries Ltd.). Among them, the nonionic surfactant is preferable in view of the storage stability. When a nonionic hydrocarbon surfactant is used, the mold release agent is transparent (no cloudiness) and has remarkably excellent storage stability.
The water-based mold release agent according to the present invention can be prepared, for example, by emulsifying the halogen-containing polyether, the surfactant and water by an ultrasonic homogenizer.
The water-based mold release agent according to the present invention may further contains d) a phosphate ester or a salt thereof having a

REFERENCES:
patent: 4427803 (1984-01-01), Fukui et al.

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