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Ribbon With Modified Polyethylene Terephthalate Substrate

IP.com Disclosure Number: IPCOM000042888D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Klueh, DR: AUTHOR

Abstract

Suitable multistrike impact typewriter ribbons can be a produced using substrate manufactured by the extrusion of 0.3 mil (0.0003 inch) polyethylene terephthalate glycol copolyester resin (PETG also known as glycol modified polyethylene terephthalate). PETG offers improved flexibility without plasticization. Synthesis of PETG is similar to that of standard polyethylene terephthalate (PET) except that more than one dibasic acid or glycol or both are copolymerized. Typically, the PETGs are clear, amorphous films with excellent toughness and chemical resistance to oils and solvents. The surface properties of the PETG films are similar to those of commercial PET film of corresponding composition and molecular weight. The active layer for multistrike may be the matrix or spongeous type generally as disclosed in U.S. Patent 3,413,184.

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Ribbon With Modified Polyethylene Terephthalate Substrate

Suitable multistrike impact typewriter ribbons can be a produced using substrate manufactured by the extrusion of 0.3 mil
(0.0003 inch) polyethylene terephthalate glycol copolyester resin (PETG also known as glycol modified polyethylene terephthalate). PETG offers improved flexibility without plasticization. Synthesis of PETG is similar to that of standard polyethylene terephthalate (PET) except that more than one dibasic acid or glycol or both are copolymerized. Typically, the PETGs are clear, amorphous films with excellent toughness and chemical resistance to oils and solvents. The surface properties of the PETG films are similar to those of commercial PET film of corresponding composition and molecular weight. The active layer for multistrike may be the matrix or spongeous type generally as disclosed in U.S. Patent 3,413,184. Other active layers may be adhesive or paper-colored cover-up material for correction. Improved sharpness of printing with no loss of print intensity is achieved. A typical matrix ink formulation is as follows: Material % by weight Polyurethane (resin body) 21 Carbon black 3.5 Blue pigment 1.8 Talc particulate (filler)
3.5 Triglyceride oil 9.3 Isopropanol (solvent)

30.45 Toluene (solvent) 30.45 An 0.3 mil film of PETG is extruded from a 50 to 1 blend of KODAR 6763* PETG and KODAR 8954* PETG, respectively. (The two are identical except KODAR 8954 PETG is compounded with amorphous si...