Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-01-22
1999-12-28
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C08J 932
Patent
active
060082712
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to adhesive compositions useful as light sealants, light coatings and the like, and more particularly to adhesive compositions containing a room temperature curing resin and a plastic microballoon surface-coated with a finely divided particulate inorganic material. The invention is also concerned with the method of making the same.
Prior Art
Room temperature curing resins have been widely used for adhesives, sealants, coatings and the like. Recently, there has been developed a resinous composition prepared by blending a room temperature curing resin with a filler in the form of microballoon so that the resulting resinous composition is lightened and provided with heat and sound insulating properties and heat dissipative property.
For example, Japanese Laid-Open Patent Publication No. 4-8788 discloses a composition comprising a liquid silicone resin blended with a plastic microballoon and used as a packing. Japanese Laid-Open Patent Publication No. 4-173867 discloses that there is used a heat insulative composition comprising a silicone resin (diorganopolysiloxane polymer) blended with a borosilicate salt microballoon and a phenol resin microballoon. Japanese Laid-Open Patent Publication No. 7-113073 discloses a delustering sealant composition comprising a room temperature curing resin blended with a plastic microballoon and/or a silica-balloon.
Such conventional micro-balloon-containing resin compositions have individual micro-balloons simply but not uniformly dispersed. Attempts to provide uniform dispersion by stirring would involve the risk of rupturing the balloons. Furthermore, such resinous compositions are not satisfactory in workability during their application and variability of their properties after the composition is cured. This is presumably caused by the microballoons dispersed irregularly into the resinous component.
DESCRIPTION OF THE INVENTION
It is an object of the invention to provide adhesive compositions useful as sealings, coatings and packings and the method of making the same.
According to the invention, there is provided an adhesive composition which comprises a room temperature curing resin, a plastic microballoon surface-coated with a finely divided particulate inorganic material, a filler and if desired, a plasticizer. The inventive adhesive composition may be prepared by moistening the surface of a plastic microballoon with a wetting-out agent, followed by admixing it uniformly with a room temperature curing resin, a plasticizer and a filler.
The term room temperature curing resin as used herein denotes a resin curable at room temperature and including moisture curing resins. Eligible for use as such room temerature curing resin are a urethane prepolymer terminated with isocyanate groups, silicone, modified silicone and a polysulfide rubber. The urethane prepolymer terminated with isocyante groups (hereinafter referred to as isocyanate-terminated prepolymer) is a product resulting from the reaction of a polyol with a polyisocyanate. The term polyols as used herein designates all kinds of polyhydroxyl compounds having a plurality of hydrogen atoms in the hydrocarbon substituted by hydroxyl groups and resulting from addition reaction of one or more alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide and tetrahydrofuran with compounds having two or more active hydrogen atoms. The latter compounds exemplarily include polyhydric alcohols such as ethylene glycol, propylene glycol, butanediol, diethylene glycol, glycerin, hexanetriol, trimethylolpropane and pentaerythritol; amines such as ethylene diamine and hexamethylene diamine; alkanol amines such as ethanol amine and propanol amine; and polyhydric phenols such as resorcin and bisphenol.
The polyols used in the invention include polyether-based polyol such as polytetramethylene glycol, polyethylene glycol, polypropylene glycol, polyoxypropylene glycol and polyoxybutylene glycol; polyolefin-based polyol such as polybutadiene polyol and polyisoprenepolyol; adipate
REFERENCES:
patent: 4011818 (1977-03-01), Stosz
Hosoda Hiroyuki
Kimura Kazushi
Michl Paul R.
Yokohama Rubber Co. Ltd.
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