Welded composites that consist of glass-fiber reinforced molded parts that were pretreated with epoxypolymers

• US 6,521,326 B1
• Filed: 11/19/2001
• Issued: 02/18/2003
• Est. Priority Date: 06/25/1999
• Status: Expired due to Fees

• Current Assignee: BASF AG (BASF SE)
• Original Assignee: BASF AG (BASF SE)
• Inventors: Welz, Martin, Fischer, Michael, Rau, Walter
• Primary Examiner(s): Chen, Vivian
• Application Number:
  US09/979,120
• Time in Patent Office: 456 Days
• Field of Search: 428/198, 428/375, 428/391, 428/412, 428/480, 428/483, 428/903.3, 156/272.2, 156/297, 156/275.1
• US Class Current: 428/198
• CPC Class Codes: B32B 27/04 as impregnant, bonding, or embedding substance not used
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: Y10T 156/1089 of discrete laminae to single face of additional lamina
• CPC Class Codes: Y10T 428/24826 Spot bonds connect components
• CPC Class Codes: Y10T 428/2933 Coated or with bond, impregnation or core
• CPC Class Codes: Y10T 428/2962 Silane, silicone or siloxane in coating
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31797 Next to addition polymer from unsaturated monomers

Abstract

A composite is composed of at least one first molding and one second molding, where the first molding and the second molding have been immovably bonded to one another via at least one partial region of one surface α of the first molding and of one surface β of the second molding, via a welded region, and where, based on the first molding, at least 50% by weight of the first molding is composed of a molding composition comprising:

A) from 5 to 99% by weight of a polyester,

B) from 1 to 95% by weight of a fibrous filler pretreated with an aminosilane compound and with an epoxy polymer,

C) from 0 to 30% by weight of an elastomeric polymer, and

D) from 0 to 40% by weight of other additives,

where the total of the percentages by weight of components A) to D) is 100%.

Laminates made from these composites, and products produced therefrom and recycled materials obtained therefrom, are described, as is the use of all of these, in particular in automotive construction.

Claims

1. A composite composed of at least one first molding and one second molding, where the first molding and the second molding have been immovably bonded to one another via at least one partial region of one surface α

of the first molding and of one surface β

of the second molding, via a welded region, and where, based on the first molding, at least 50% by weight of the first molding is composed of a molding composition comprising;

A) from 5 to 99% by weight of a polyester,

B) from 1 to 95% by weight of a fibrous filler pretreated with an aminosilane compound and with an epoxy polymer,

C) from 0 to 30% by weight of an elastomeric polymer, and

D) from 0 to 40% by weight of other additives,

where the total of the percentages by weight of components A) to D) is 100%.

2. A composite as claimed in claim 1, with a molding composition comprising

from 20 to 98% by weight of component A),

from 1 to 55% by weight of component B), and

from 1 to 25% by weight of component C).

3. A composite as claimed in claim 1, where component A) comprises a mixture of polybutylene terephthalate and polyethylene terephthalate and/or from a polycarbonate.

4. A composite as claimed in claim 1, where the arithmetic mean fiber length of component B) is from 5 to 25 mm.

5. A composite as claimed in claim 1, where component C) comprises from 0.1 to 30% by weight, based on 100% by weight of C), of functional monomers.

6. A composite as claimed in claim 1, where at least one of the moldings exhibits one or more of the following features i) to vii):

i) carbon emission to PV 3341 <

50 μ

g of carbon per gram;

ii) result of odor test to DIN 50 011/PV 3900 better than grade 5;

iii) Vicat B softening point >

120°

C.;

iv) density from 1.1 to 1.5 g/m³;

flowability as melt volume rate at 275°

C. with 2.16 kp to ISO 1133 of >

10 cm³/10 min;

vi) compared with the value prior to heat-aging, fall-off in impact strength to ISO 179/1 eU after 1000 h of heat-aging at 120°

C. of <

30%;

vii) elongation at break to DIN 53457 after 1000 h of heat-aging at 130°

>

2%.

7. A process for producing a composite as claimed in claim 1, in which at least one partial region of the surface α

is welded to one partial region of the surface β

, forming a welded region.

8. A process as claimed in claim 7, where the welded region has at least an ultimate tensile strength of from 25 to 75 N/mm².

9. A composite which can be obtained by a process where at least one partial region of a surface α

of the first molding defined in claim 1 is welded to one partial region of a surface β

of the second molding defined in claim 1, forming a welded region.

10. A composite as claimed in claim 1, where the welded region has at least an ultimate tensile strength of from 25 to 75 N/mm².

11. A process for recycling moldings or molding compositions, each of which comprises a composite as claimed in claim 1.

12. A recycled material which can be obtained from moldings or molding compositions, each of which comprises a composite as claimed in claim 1.

13. The method of using a recycled materials as claimed in claim 12.

14. A product or a laminate, in each case comprising recycled materials as claimed in claim 12.

15. The method of using a composite as claimed in claim 1.

16. A product or a laminate, in each case comprising a composite as claimed in claim 1.

17. The method of using products or laminates as claimed in claim 16, in motor vehicles.

18. The method of using a composite as claimed in claim 1, in motor vehicles.