Synthetic papers and method of making the same

Details Synthetic papers and method of making the same Synthetic papers and method of making the same

1978-08-14

1982-03-09

Silverman, Stanley S.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428148, 428150, 428211, 428409, 428910, 4283115, 4283155, 4283159, 4283166, B32B 326

Patent

active

043189504

ABSTRACT:
A laminated structure forming a synthetic paper made of a base or backing film layer made of a thermoplastic resin in a biaxially oriented state. A paper-like film layer is laminated to the base film layer and comprises a thermoplastic resin having 0.5 to 65% by weight of particles of a fine, inorganic filler dispersed in the resin thereof substantially uniformly. The paper-like film layer is in an uniaxially oriented state and has microvoids dispersed therein formed by stretching the laminated films in a heated state. The microvoids comprise microvoids open to a surface of the paper-like film layer free of the base film layer and include microvoids, open and closed, distributed in the paper-like film layer defining therein a cellular, fibrous structure. The two films are formed from thermoplastic resinous compositions in which the components of each composition are well admixed and particles of a fine filler are uniformly distributed in the thermoplastic resin of the paper-like film layer to obtain, as much as possible, microvoids distributed therein uniformly. After the base film layer is formed, it is stretched in a heated state in a machine for longitudinal direction to orient the film uniaxially. The paper-like layer is laminated under pressure on one surface of the base film layer while in a melted state and the resulting laminated structure is stretched transversely to at least 2.5 times the original transverse dimension of the portion of film being stretched between grippers of a stretching machine. This orients the base film layer biaxially and the paper-like film layer uniaxially. The stretching must be sufficient for the stretching and particles of filler to develop microvoids in the paper-like film layer rendering it a cellular and fibrous structure.

REFERENCES:
patent: 3154461 (1964-10-01), Johnson
patent: 3515626 (1970-06-01), Duffield
patent: 3738904 (1973-06-01), Ikeoa
patent: 3783088 (1974-01-01), Yoshiyasu
patent: 3790435 (1974-02-01), Tanba et al.
patent: 4113908 (1978-09-01), Shinomura

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