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Last Updated Saturday, August 29 2015


Published August 10, 2005
Patent No. U.S. 6,447,844 B1
Honda Giken Kogyo Kabushiki
Kaisha, Tokyo, Japan, and Honda of
America Mfg., Inc., Marysville, OH,
have been awarded a patent for a
method to coat polypropylene materials.
It is comprised of pretreating in
which a polypropylene material is
beforehand cleaned, and then applying
a water-based adhesion promoter,
which is comprised of a grafted
polypropylene chloride, which
includes a polypropylene chloride
moiety and a maleic anhydride moiety
as bonded thereto, and which has
a chlorine content of 15-25 weight
percent and a maleic anhydride moiety
content of one to five weight percent;
an amine-neutralized water-soluble
resin; a wettability-improving
agent; and water. It is characterized
by a combination ratio of 25-90 weight
percent as of the grafted polypropylene
chloride to the total of the grafted
polypropylene chloride and the amineneutralized
water-soluble resin; and a
combination ratio of 2.5-six weight
percent as of the wettability-improving
agent to the entirety of the promoter.
The pretreated material is
dried and a paint is coated on the pretreated

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