US 12,257,820 B2
Multilayered flooring decorative material
Deuk Soo Lee, Chungcheongnam-do (KR); Sang Hyun Lee, Chungcheongnam-do (KR); Byeong Ro Jung, Chungcheongbuk-do (KR); and Jang Wook Kim, Gyeonggi-do (KR)
Assigned to KCC Glass Corporation, Seoul (KR)
Appl. No. 17/921,449
Filed by KCC Glass Corporation, Seoul (KR)
PCT Filed Apr. 28, 2021, PCT No. PCT/KR2021/005386
§ 371(c)(1), (2) Date Oct. 26, 2022,
PCT Pub. No. WO2021/221465, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 10-2020-0052731 (KR), filed on Apr. 29, 2020.
Prior Publication US 2023/0158772 A1, May 25, 2023
Int. Cl. B32B 5/32 (2006.01); B32B 38/08 (2006.01); E04F 15/10 (2006.01)
CPC B32B 5/32 (2013.01) [B32B 38/08 (2013.01); E04F 15/107 (2013.01); B32B 2250/05 (2013.01); B32B 2260/021 (2013.01); B32B 2260/046 (2013.01); B32B 2266/0235 (2013.01); B32B 2305/022 (2013.01); B32B 2305/22 (2013.01); B32B 2307/308 (2013.01); B32B 2451/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multilayered flooring decorative material comprising a first foam layer and a second foam layer, wherein
the first foam layer is formed by foaming a foam layer composition by a mechanical method,
the second foam layer is formed by mechanically foaming the foam layer composition and then impregnating a fiberglass substrate with the foam layer composition, and
the foam layer composition comprises 40 to 50 parts by weight of a polyvinyl chloride resin, 35 to 45 parts by weight of a plasticizer, 5 to 15 parts by weight of a filler, 1 to 5 parts by weight of a heat-resistant stabilizer and 1 to 10 parts by weight of a silicone foam stabilizer, wherein the polyvinyl chloride resin has a weight average molecular weight (MW) of 150,000 to 230,000 g/mol,
wherein the heat-resistant stabilizer is at least one selected from the group consisting of stearic acid and metallic stearate, and
wherein the multilayered flooring decorative material has a length change rate by absorption of 0.02 to 0.03%.