Plastic and nonmetallic article shaping or treating: processes – With step of cooling to a temperature of zero degrees c. or...
Patent
1991-12-20
1993-08-31
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
With step of cooling to a temperature of zero degrees c. or...
264 41, 264154, 264171, 2642093, 2642102, 2642356, 264564, 429254, B29C 4706, B29C 6720, B32B 3100
Patent
active
052406555
ABSTRACT:
A process of having a microporous multiply sheet product which is capable of becoming non-porous at a predetermined elevated transformation temperature is formed by first forming a non-porous, multiply initial sheet product having at least one first ply and at least one second ply, each with its own viscosity profile. The initial sheet product is then stretched and annealed to impart porosity to the sheet product.
REFERENCES:
patent: 4650730 (1987-03-01), Lundquist et al.
Giovannoni Richard T.
Guo Yihong
Rein Burton M.
Spotnitz Robert M.
Troffkin Howard J.
Tentoni Leo B.
Troffkin Howard J.
W. R. Grace & Co.,-Conn.
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