Plastic pencils

Details Plastic pencils Plastic pencils

1975-09-16

1977-12-20

Briggs, Sr., Wilbert J.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including holder

260 25HA, 260 25HB, 260 4218, 260897A, 264176R, 264129, 428500, 428516, B43K 1902, C08L 2306

Patent

active

040638286

ABSTRACT:
Plastic pencils comprising a writing core, a porous casing to enclose said writing core, and a coating which is coated on the surface of said porous casing, said casing being a homogeneous unitary mixture composed of 100 parts by weight of atactic polystyrene, 10-40 parts by weight of polyethylene, 10-55 parts by weight of glass fibers and the required amount of coloring agent and having sharpenability comparable to that of incense cedar and a flexural modulus in excess of 30,000 kg/cm.sup.2, and said coating being a homogeneous unitary mixture composed of 100 parts by weight of atactic polystyrene, 5-50 parts by weight of polyolefin and a required amount of a coloring agent.

REFERENCES:
patent: 3474048 (1969-10-01), Chappelear et al.
patent: 3520834 (1970-07-01), Mizutani et al.
patent: 3551064 (1970-12-01), Bartner

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