Multi-layer foam sheet and interleaf sheet for glass plates

Patent metadata

Field	Value
Publication number	US-10124564-B2
Application number	US-201515122559-A
Country	US
Kind code	B2
Filing date	Feb 26, 2015
Priority date	Mar 5, 2014
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

A multi-layer foam sheet with an apparent density of 30 to 300 kg/m 3 and a thickness of 0.05 to 2 mm, including a foam layer containing a polyethylene-based resin (A), and an antistatic layer fusion-laminated by coextrusion on each of both sides of the foam layer. The antistatic layer has a basis weight of 1 to 10 g/m 2 and contains a polyethylene-based resin (B), a polystyrene-based resin, a styrenic elastomer, and a polymeric antistatic agent, with the polystyrene-based resin being contained in the antistatic layer in an amount of 15 to 70% by weight.

First claim

The invention claimed is:

1. A multi-layer foam sheet with an apparent density of 30 to 300 kg/m 3 and a thickness of 0.05 to 2 mm, comprising
a foam layer that comprises a polyethylene-based resin (A), and
an antistatic layer that is fusion-laminated by coextrusion on each of both sides of the foam layer,
wherein the antistatic layer has a basis weight of 1 to 10 g/m 2 and contains a polyethylene-based resin (B), a polystyrene-based resin, a styrenic elastomer and a polymeric antistatic agent, with the polystyrene-based resin being present in an amount of 25 to 60% by weight based on the weight of the antistatic layer,
wherein both of the polyethylene-based resin (B) and the polystyrene-based resin form continuous phases with the polymeric antistatic agent being dispersed in the continuous phase of the polyethylene-based resin (B).

2. The multi-layer foam sheet as recited in claim 1 , wherein the polystyrene-based resin is present in an amount of 30 to 50% by weight based on the weight of the antistatic layer.

3. The multi-layer foam sheet as recited in claim 1 , wherein the styrenic elastomer is present in an amount of 2 to 20% by weight based on the weight of the antistatic layer.

4. The multi-layer foam sheet as recited in claim 1 , wherein the polymeric antistatic agent is present in an amount of 2 to 30% by weight based on the weight of the antistatic layer.

5. The multi-layer foam sheet as recited in claim 1 , wherein the polyethylene-based resin (A) contains low density polyethylene as a major component.

6. The multi-layer foam sheet as recited in claim 1 , wherein the polyethylene-based resin (B) contains low density polyethylene as a major component.

7. An interleaf sheet for glass plates comprising a multi-layer foam sheet as recited in claim 1 .

Assignees

• Jsp Corp

Inventors

• Aoki Takeshi
• Nishimoto Takashi
• FUJITA Mikidai
• Takeuchi Ryohei

Classifications

• B65D65/40

  Applications of laminates for particular packaging purposes {(B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or)} · CPC title

• B32B2307/56

  Damping, energy absorption · CPC title

• B32B5/18

  characterised by features of a layer {of} foamed material · CPC title

• B65D85/48

  for glass sheets · CPC title

• B32B27/18

  characterised by the use of special additives · CPC title