Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-10-08
2000-08-01
Hampton-Hightower, P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 67, 525 87, 526279, C08F 2900, C08F 238
Patent
active
060968273
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a fluorine-containing graft copolymer and its manufacturing method. The fluorine-containing graft copolymer is synthesized by copolymerization of a monomer with perfluoroalkyl group and a macromonomer that has copolymerizable vinyl group at one end of a molecule. Thus, the graft copolymer consists of the perfluoroalkyl lo compound and macromonomer segment as a backbone and branched chains, respectively. Since the graft copolymer has miscibility with the substrates for surface modification, various applications are expected in the field of water/oil repellent, soil release agents, mold release agents, etc.
BACKGROUND OF THE INVENTION
Fluorine-containing copolymers, obtained by copolymerization of the perfluoroalkyl compound with other copolymerizable vinyl monomers, have been known to be very useful as low-energy surface modifiers in various forms hitherto. But it is known that perfluoroalkyl compounds show poor adhesiveness due to the extremely low-energy surface characteristics with various substrates like fiber, plastic, rubber, ceramic and metal etc.
Therefore to improve the adhesiveness, comonomers have been used which have relatively high surface energy with the affinity or may be adhered by reaction to the substrates.
However, in case of random copolymers, the perfluoroalkyl compound and comonomers are resided in the backbone concurrently, thus show the mixed surface properties of the two monomers; Namely, the low-energy modification characteristics from the perfluoroalkyl compound is damaged by high surface energy comonomer, and the surface modification effect of the copolymer is reduced. Therefore, when the random copolymer is used tor low-energy, surface modification of substrates, excessive amounts of high-priced perfluoroalkyl compound should be used in order to reduce the surface energy of the substrate to the desired level. And manufacturing costs of the random copolymer are deemed to be high compared with the performances.
Recently, a graft type copolymer was synthesized using oligomer of perfluoroalkyl compound as branched chains and other comonomers as a backbone by solution or emulsion polymerization. And the graft copolymers have been used as a fluorine-containing surface modifier (Japanese Patent unexamined publication Soh 54-137489 and Soh 56-163183).
However, in case of forementioned method, an high surface energy group from the initiator is attached in the fluorinated oligomer which has so small molecular weight (degree of polymerization: about 10), and the low-energy surface properties of perfluoroalkyl group is hindered by initiator group. Hence the surface modification performance is reduced.
Furthermore, since the homopolymer of perfluoroalkyl compound as a branched chain has lower degree of polymerization, its mechanical properties may be suspected.
The inventor et al. has made their intensive studies for several years on new fluorine-containing surface modifier that has improved surface properties, surface modification effect and compatibility with substrates. As the results, the fluorine-containing graft copolymer is synthesized the emulsion copolymerization of a perfluoroalkyl compound and a macromonomer that has only high molecular weight perfluorinated segments in the backbone and shows an affinity of a branched chain to the substrates, respectively.
SUMMARY OF THE INVENTION
The object of present invention is to provide the fluorine-containing graft copolymer and its manufacturing method having better low-energy surface modification properties and superior compatibility with the substrates compared with random copolymers or graft copolymers with a oligomer of perfluoroalkyl compound as mentioned above which have been used largely as a surface modifier at present.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a graft copolymer for a surface modifier comprising the perfluoroalkyl compound selected from the following chemical formulas (1), (2), (3) and (4) as a backbone with macromonomers
REFERENCES:
patent: 5594067 (1997-01-01), Doi et al.
Japanese Patent Unexamined Publication No. Sho 54-137489, dated Oct. 25, 1979 (English Translation of Claims).
Japanese Patent Unexamined Publication No. Sho 56-163183, dated Dec. 15, 1981 (English Translation of Claims).
"Synthesis and Application of Fluorine Containing Graftcopolymers", Yuya Yamashita et al., Polymer Bulletin 5, 335-340 (1981).
Kim Dong Kwon
Kim Kwang Je
Lee Kwang Won
Lee Soo Bok
Park In Jun
Hampton-Hightower P.
Korea Research Institute of Chemica Technology
LandOfFree
Fluorine-containing graft copolymer and its manufacturing method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluorine-containing graft copolymer and its manufacturing method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluorine-containing graft copolymer and its manufacturing method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-664772