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Flexible acrylic foam composition

A composition, acrylic technology, applied in the field of acrylic foam composition, can solve problems such as expensive process and complexity

Inactive Publication Date: 2010-07-21
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this proposal can solve the problem of cell collapse, this solution requires a more complicated and expensive process than the traditional processing technology used to foam plastics, because it requires combining monomers and glass microspheres (i.e., 10- 200μm) mixture is coated on the substrate and then polymerized in situ to a pressure sensitive adhesive state

Method used

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  • Flexible acrylic foam composition
  • Flexible acrylic foam composition
  • Flexible acrylic foam composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0128] Four preparations containing different amounts of processing aids, Paraloid TM K-120ND was formulated and processed according to the recipe preparation and foam extrusion methods described above.

[0129] Table 2 gives details of these formulations.

[0130] Table 2

[0131]

[0132] After foam extrusion, the resulting articles were tested for structural properties (ie, density, average cell diameter, and thickness) and mechanical properties (ie, tensile strength at break and elongation at break) according to the corresponding test methods described above.

[0133] As shown in Table 3, the addition of processing aids improves the cell structure (ie reduces average cell diameter, increases cell uniformity) and thus slightly improves the flexibility of the final slab (ie increases elongation at break by about 100%). The improvement in flexibility is constrained by the fact that, namely, Paraloid TM K-120ND (made of rigid polymer chains (because of the amount of MM...

Embodiment 5-6

[0137] Two formulations containing different amounts of processing aids were prepared and processed according to the methods of formulation preparation and foam extrusion described above.

[0138] Table 4 gives details of these formulations.

[0139] Table 4

[0140]

[0141] After foam extrusion, the resulting articles were tested for structural properties (ie, density, average cell diameter, and thickness) and mechanical properties (ie, tensile strength at break and elongation at break) according to the corresponding test methods described above.

[0142] Table 5 gives details of these formulations.

[0143] table 5

[0144]

Embodiment 7-11

[0146] Five formulations containing different amounts of processing aids were prepared and processed according to the methods of formulation preparation and foam extrusion described above.

[0147] Table 6 gives details of these formulations.

[0148] Table 6

[0149]

[0150] By mixing Paraloid TM K-120ND Emulsion with Low T g Acrylic homopolymer or copolymer emulsion to prepare Soft PA1, Soft PA2, Soft PA3 and Soft PA4. Soft PA1, Soft PA2, Soft PA3 and Soft PA4 were freeze-dried with dry ice, and then heated in an oven at 60°C for 24 hours to remove moisture. Then, the resulting flexible mass was crushed into pellets with a diameter of about 5 mm using scissors. Soft PA4 is obtained by spray drying in powder form.

[0151] Poly(n-butyl acrylate) is an acrylic homopolymer made from 100% by weight n-butyl acrylate monomer. Poly(ethyl acrylate) is an acrylic homopolymer made from 100% by weight ethyl acrylate monomer. These polymers are made by common aqueous emulsio...

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Abstract

The present invention relates to an acrylic foam composition comprising an acrylic polymer and an acrylic processing aid which exhibits increased flexibility characteristics over other types of foam compositions.

Description

technical field [0001] This invention relates to flexible acrylic foam compositions. More specifically, the present invention relates to acrylic foam compositions that exhibit increased flexibility properties over other types of foam compositions. Background technique [0002] Several attempts have been made to produce acrylic foams because the market demands foams that combine flexibility and other advantages such as good performance / price ratio, tailoring properties, good weather resistance and good biocompatibility with human tissue product. [0003] While acrylic polymers offer these additional advantages, making flexible acrylic polymers requires the use of acrylate monomers, which results in polymers with low Tg. The problem with acrylic polymers having a low Tg is that they are inherently sticky. This represents a critical problem in foam construction because, when the foam is squeezed, the cells collapse irreversibly. As described in US Patent No. 3,565,247, cohe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L53/00C08L33/00C08K3/26C08J9/04
CPCC08J2433/00C08J2203/04C08J2353/00C08J9/0061C08J9/04C08L33/08
Inventor M·O·桑纳蒂S·森达瑞P·V·范雷内
Owner ROHM & HAAS CO