Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1996-08-08
1998-08-25
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524491, C08K 501
Patent
active
057984042
ABSTRACT:
The hair care appliance of this invention has a housing, which holds a set of hair curlers and encloses electrical heating means for heating the curlers, and has a transparent cover which covers the set of curlers and the top of the housing. Each curler has a reversibly thermochromic thermoplastic elastomeric surface layer (around which hair is to be curled) which preferably covers a mandrel portion of a thermoplastic body. The thermoplastic body has ends of larger diameter than the mandrel portion of the body, and the mandrel may be hollow. A hollow mandrel may contain a double-walled metal core, which may contain a heat-retaining material. The elastomeric surface layer is preferably molded from an thermoplastic elastomer composition containing particulate thermochromic material, which preferably comprises reversibly thermochromic dye encapsulated in micro-capsules. The thermochromic dye components are chosen to be non-toxic and environmentally benign. The combination is preferably prepared to have a complete and distinct color change at a curler temperature optimum for curl retention. The colors within the preferred curling temperature range and outside that range are easily distinguished by users, even if they suffer from red/green color blindness. Thermochromic thermoplastic elastomer (TTPE) compositions for the curler mandrel surface layer are disclosed, along with a process for preparing such compositions. Preferred processes for manufacturing the curlers using the TTPE compositions are disclosed.
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Monty Lawrence P.
Monty Patrick T.
Michl Paul R.
Touw Theodore R.
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