Polyolefin resin foam sheet and laminate
AssigneeToray Industries, Inc.
InventorsHirotaka Kondo, Yoshiyuki Oka
Life of this patent
Estimating the term…
Abstract
A polyolefin resin foam sheet includes a resin mixture as a base resin, the resin mixture including 0% by mass or more and 30% by mass or less of polyethylene resin, 30% by mass or more and 80% by mass or less of polypropylene resin, and 20% by mass or more and 40% by mass or less of a polyolefin elastomer, the polyolefin resin foam sheet fulfilling a range of −35% or more and 0% or less for dimensional changes in machine and transverse directions under heating for 10 minutes at a temperature 20° C. higher than a maximum melting point that is a highest melting peak in a differential scanning calorimetry.
Claims11
A polyolefin resin foam sheet comprising:
- a blowing agent and/or a decomposition product of a blowing agent, and an antioxidant and/or a decomposition product of an antioxidant, and
- a resin mixture as a base resin, the resin mixture comprising 10% by mass or more and 13% by mass or less of polyethylene resin, 50% by mass or more and 67% by mass or less of polypropylene resin, and 20% by mass or more and 40% by mass or less of a polyolefin elastomer, wherein the sum of the content of the polyethylene resin, the polypropylene resin, and the polyolefin elastomer is 100%, the polyolefin resin foam sheet having −28.9% to 0% for dimensional changes in machine direction and −21.0% to 0% in transverse direction under heating for 10 minutes at a temperature 20° C. higher than a maximum melting point that is a highest melting peak in a differential scanning calorimetry and having a −24.5% to 0% for an average of dimensional change in the machine direction and dimensional change in the transverse direction under heating for 10 minutes at the temperature 20° C. higher than the maximum melting point that is the highest melting peak in the differential scanning calorimetry;
- wherein the MD stretch ratio is controlled within approximately 2.0-2.7 and the draw down ratio is held at or near 1.0-1.6 during sheet formation.
Dependencies are inferred from the claim text.