Endless belt power transmission systems or components – Friction drive belt – Including embedded elongated strand having multiple...
Reexamination Certificate
2005-11-15
2005-11-15
Sergent, Rabon (Department: 1711)
Endless belt power transmission systems or components
Friction drive belt
Including embedded elongated strand having multiple...
C474S263000, C474S264000, C474S265000, C474S266000, C528S060000, C528S061000, C528S063000, C528S064000, C528S065000, C528S066000, C528S067000, C528S074000, C528S080000, C528S081000, C528S083000, C528S085000, C528S906000
Reexamination Certificate
active
06964626
ABSTRACT:
The present invention relates to molded polyurethane/urea elastomers, and specifically to improved polyurethane/urea elastomers having high temperature stability to about 140–150° C. and low temperature flexibility at about −35–(−40)° C., for use in dynamic applications. These elastomers are particularly useful for application in belts, specifically in automotive timing or synchronous belts, V-belts, multi V-ribbed or micro-ribbed belts, flat belting and the like. The polyurethane/urea elastomers of the present invention are prepared by reacting polyisocyanate prepolymers with symmetric primary diamine chain extenders, mixtures of symmetric primary diamine chain extenders and secondary diamine chain extenders, or mixtures of symmetric primary diamine chain extenders and non-oxidative polyols, which are all chosen to eliminate the need for catalysts via standard molding processes, and to improve phase separation. The polyisocyanate prepolymers are reaction products of polyols which are nonoxidative at high temperatures, such as polycarbonate polyols, polyester polyols, or mixtures thereof, with organic polyisocyanates which are either compact, symmetric and aromatic, such as para-phenylene diisocyanate, 1,5-naphthalene diisocyanate, and 2,6-toluene diisocyanate, or are aliphatic and possess trans or trans,trans geometric structure, such as trans-1,4-cyclohexane diisocyanate and trans,trans-4,4′-dicyclohexylmethyl diisocyanate.
REFERENCES:
patent: 3620905 (1971-11-01), Ahramjian
patent: 3789032 (1974-01-01), Hoeschele
patent: 3857819 (1974-12-01), Mathis
patent: 3997514 (1976-12-01), Kogon
patent: 4256869 (1981-03-01), Schulze et al.
patent: 4337130 (1982-06-01), Ahramjian
patent: 4423200 (1983-12-01), Ganster et al.
patent: 4442281 (1984-04-01), Hentschel et al.
patent: 4487913 (1984-12-01), Chung
patent: 4507459 (1985-03-01), Schmidt et al.
patent: 4519432 (1985-05-01), Schmidt et al.
patent: 4892920 (1990-01-01), Quay et al.
patent: 4952632 (1990-08-01), Gras et al.
patent: 4970306 (1990-11-01), Gras et al.
patent: 4990586 (1991-02-01), Case
patent: 5021534 (1991-06-01), Kawasaki et al.
patent: 5066762 (1991-11-01), Ohbuchi et al.
patent: 5086150 (1992-02-01), Frauendorf et al.
patent: 5106874 (1992-04-01), Porter et al.
patent: 5112282 (1992-05-01), Patterson
patent: 5141967 (1992-08-01), Mafoti et al.
patent: 5185420 (1993-02-01), Smith et al.
patent: 5208315 (1993-05-01), Seneker
patent: 5231159 (1993-07-01), Patterson et al.
patent: 5262448 (1993-11-01), Ruckes et al.
patent: 5410009 (1995-04-01), Kato et al.
patent: 0410240 (1991-01-01), None
patent: 0579989 (1994-01-01), None
Syed et al.; “Stability in the Water: Aliphatic Diisocyanates in PUs”; Urethanes Technology; Jul., 1988; pp. 25-27.
“A TPE based on p-phenylene dissocyanate”, David Russel, Ralph Moore, Wayne C. Welchel, Rubber and Plastic News, Sep. 30, 1991, pp 15-18.
“High Performance Thermoplastic Polyurethane Elastomer”, Y. Maeda, Y. Ohbuchi, S. Sato, 32dAnnual Polyurethane Technical/Marketing Conference,Oct. 1-4, 1989, pp 112-117.
“Castable Polyurea Elastomers for Toothed Belts”, Y. Taguchi, M. Furukawa, T. Yokoyama, Plastics, Rubber and Composites Processing and Applications, vol. 21, No. 4, Apr. 1994, pp 219-224.
Brothers W. Joe
Stamp James R.
Wu William W. L.
Austin, Esq. S. G.
Castleman, Esq. C. H.
Sergent Rabon
The Gates Corporation
Thurnau, Esq. J. A.
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