Resin composition for laminated glass interlayer film or solar cell encapsulant, laminated glass interlayer film, laminated glass, solar cell encapsulant, and solar cell module

A resin composition used for forming a laminated glass interlayer film or a solar cell encapsulant, the resin composition comprising:

• an ionomer (A) of an ethylene-unsaturated carboxylic acid-based copolymer,
• wherein metal ions constituting the ionomer (A) of the ethylene-unsaturated carboxylic acid-based copolymer includes two or more kinds of polyvalent metal ions,
• the polyvalent metal ions include zinc ion and magnesium ion,
• a molar ratio of the zinc ion to the magnesium ion is equal to or more than 0.67 and equal to or less than 1.68,
• the resin composition further comprises a silane coupling agent (B), and
• a haze as measured by the following method is less than 0.8%:
• (method)
• a film having a size of 120 mm×75 mm×0.4 mm and formed from the resin composition is obtained;
• next, the film thus obtained is interposed between glass plates each having a size of 120 mm×75 mm×3.2 mm, the assembly is maintained in a vacuum at 140° C. for 5 minutes in a vacuum laminator and is subjected to pressing for 3 minutes at 0.1 MPa (gauge pressure), and thus a laminated glass is obtained;
• and next, the haze of the laminated glass is measured according to JIS K7136 using a haze meter.