SUBSTRAT EN RÉSINE POUR PARE-BRISE SANS MONTANT

摘要

Provided is a resin substrate for the pillarless windshield which is large yet light-weight and provides excellent visibility, and has further realized a high strength to withstand a load calculated based on air resistance under the driving speed of 150 km/h. The resin substrate for the pillarless windshield has the longest side (S_A) fixed to car body (3), wherein the resin substrate is an uneven-thickness structure having viewing section (1) with a mean thickness (d₁) of 3-7 mm and thick-walled section (2) with a thickness of 1.3 times the (d₁) or more, and satisfies all requirements of following (a)-(d): (a) the resin substrate having thin-walled viewing section (1) in the center, and having thick-walled sections (2B, 2C and 2D) along total three sides of (S_B, S_Cand S_D): opposite side (S_B) of the longest side (S_A), and two sides (S_Cand S_D) between the ends of the longest side (S_A) and those of the opposite sides (S_B) of the longest side, (b) the viewing section (1) and thick-walled section (2) being made of an optically-transparent thermoplastic resin satisfying 5% or less of a haze at 6-mm thickness measured according to JISK7105, (c) the longest side (S_A) having a length (L₁) of 900 mm or longer and 2000 mm or shorter, (d) the thick-walled sections (2B, 2C and 2D) having mean thicknesses (d_2B, d2_Cand d_2D) each 3.0 times or less of the d₁and an area accounting for 3-20% of the whole area of the resin substrate.