Manual method for injection molding coated components

Patent metadata

Field	Value
Publication number	US-11926076-B2
Application number	US-201917295802-A
Country	US
Kind code	B2
Filing date	Nov 5, 2019
Priority date	Nov 23, 2018
Publication date	Mar 12, 2024
Grant date	Mar 12, 2024

Abstract

Described herein is a manual process for injection molding of coated components, more particularly coated soles of plastic, where first of all the molding tool is lined with a release agent composition and, after flashing of this release agent composition, a composition for forming the component is injected. After crosslinking of these two compositions, the produced coated component is removed from the molding tool and subjected optionally to an aftertreatment.

First claim

The invention claimed is:

1. A manual process for injection molding of coated components, the process comprising the following steps in the order indicated:
(A) applying a release agent composition to at least one inside of at least one molding part of a closable molding tool,
(B) flashing the release agent composition applied in step (A),
(C) optionally inserting at least one material M1 and heating of the molding tool,
(D) applying a composition Z1 into the opened molding tool,
(E) manually closing the molding tool,
(F) crosslinking the release agent composition and also the composition Z1 applied in process step (D),
(G) optionally applying at least one further composition Z2 and crosslinking the composition(s),
(H) manually opening the molding tool,
(I) manually removing the molded coated component, and
(J) optionally aftertreating the molded coated component, wherein the release agent composition comprises:
(a) at least one solvent L,
(b) at least one compound of the general formula (I)
R 1 —(C═O) t —O-(AO) s —R 2   (I)

in which R 1 is a saturated or unsaturated, aliphatic hydrocarbon radical having 6 to 30 carbon atoms,
R 2 is H, a PO(OH) 2 radical, or the optionally partially phosphated radical of a monosaccharide or disaccharide, or the optionally partially phosphated radical of an alditol,
AO stands for one or more alkylene oxide radicals selected from the group consisting of ethylene oxide, propylene oxide and butylene oxide,
r is 0 or 1, and s is 0 to 30;
(c) optionally at least one polyether-modified alkylpolysiloxane,
(d) at least one polysiloxane of the general formula (II)
R 3 —Si(R 4 ) 2 [O—Si(R 4 )(R 5 )] a —[O—Si(R 4 ) 2 ]b-O—Si(R 4 ) 2 —R 3   (II),

in which
R 3 and R 4 , in each case independently of one another, are a methyl group or a (HO—CH 2 ) 2 —C(CH 2 —CH 3 )—CH 2 —O—(CH 2 ) 3 —* radical,
R 5 is a methyl group,
a is 0 or 1 to 10, and
b is 3 to 30; and
(e) optionally at least one binder B.

2. The process as claimed in claim 1 , wherein the release agent composition has a viscosity of 10 to 60 s.

3. The process as claimed in claim 1 , wherein, in the general formula (I), R 1 is a saturated or unsaturated aliphatic hydrocarbon radical having 10 to 24 carbon atoms, R 2 is H, a PO(OH) 2 radical, or the optionally partially phosphated radical of a monosaccharide or disaccharide, or the optionally partially phosphated radical of an alditol, AO stands for one or more alkylene oxide radicals selected from the group consisting of ethylene oxide and propylene oxide, r is 0 or 1, and s is 0 or 1 to 25.

4. The process as claimed in claim 1 , wherein the release agent composition comprises the at least one compound of the general formula (I) in a total amount of 0.1 to 10 wt % based on the total weight of the release agent composition.

5. The process as claimed in claim 1 , wherein the polyether-modified alkylpolysiloxane comprises at least one structural unit (R 7 ) 2 (OR 6 )SiO 1/2 and at least one structural unit (R 7 ) 2 SiO 2/2 , where R 6 is an ethylene oxide, propylene oxide, and butylene oxide group and R 7 is a C 1 -C 10 alkyl group.

6. The process as claimed in claim 1 , characterized in that the release agent composition comprises the at least one polyether-modified alkylpolysiloxane in a total amount of 0 wt % or of 0.1 to 6 wt % based on the total weight of the release agent composition.

7. The process as claimed in claim 1 , wherein, in the general formula (II), the radical R 3 is a (HO—CH 2 ) 2 —C(CH 2 —CH 3 )—CH 2 —O—(CH 2 ) 3 —* radical, the radical R 4 is a methyl group, the radical R 5 is a methyl group, a is 0, and b is 7 to 14.

8. The process as claimed in claim 1 , wherein the release agent composition comprises the at least one polysiloxane of the general formula (II) in a total amount of 0.1 to 5 wt % based on the total weight of the release agent composition.

9. The process as claimed in claim 1 , wherein the release agent composition comprises the at least one binder B in a total amount (solids content) of 20 to 50 wt % based on the total weight of the composition.

10. The process as claimed in claim 1 , wherein the binder B is selected from the group consisting of (i) poly(meth)acrylates, (ii) polyurethanes, (iii) polyesters, (iv) polyethers, (v) copolymers in the stated polymers, and (vi) mixtures thereof.

11. The process as claimed in claim 1 , wherein the release agent composition is flashed in process step (B) for a period of 20 seconds to 120 minutes.

12. The process as claimed in claim 1 , wherein the composition Z1 applied in process step (D) is a polymer foam.

13. The process as claimed in claim 1 , wherein the crosslinking in process step (F) takes place for a period of 1 to 20 minutes.

14. The process as claimed in claim 1 , wherein the process comprises a further process step in which the molding tool, after the removal of the coated component in process step (I), is cleaned.

15. The process as claimed in claim 14 , wherein the further process step is carried out after 20 to 100 repetitions of process steps (A) to (I).

16. The process as claimed in claim 1 , wherein the release agent composition comprises the at least one compound of the general formula (I) in a total amount of 0.5 to 5 wt %, based on the total weight of the release agent composition.

17. The process as claimed in claim 1 , wherein the polyether-modified alkylpolysiloxane comprises at least one structural unit (R 7 ) 2 (OR 6 )SiO 1/2 and at least one structural unit (R 7 ) 2 SiO 2/2 , wherein R 6 is a mixture of ethylene oxide and propylene oxide and butylene oxide groups, and R 7 is a methyl group.

18. The process as claimed in claim 1 , characterized in that the release agent composition comprises the at least one polyether-modified alkylpolysiloxane in a total amount of 0.5 to 4 wt %, based on the total weight of the release agent composition.

19. The process as claimed in claim 1 , wherein the release agent composition comprises the at least one polysiloxane of the general formula (II) in a total amount of 0.5 to 4 wt %, based on the total weight of the release agent composition.

20. The process as claimed in claim 1 , wherein the binder B is selected from the group consisting of (i) hydroxy-functional and/or carboxylate-functional and/or amine-functional poly(meth)acrylates, (ii) hydroxy-functional and/or carboxylate-functional and/or amine-functional polyurethanes, (iii) polyester polyols, (iv) polyether polyols, (v) copolymers in the stated polymers, and (vi) mixtures thereof.

Assignees

• Basf Coatings Gmbh

Inventors

• Reuter Karin
• Fedeler Lea
• Winzen Simon
• Noatschk Jens-Henning
• Lenz Joerg

Classifications

• B29C33/64 Primary

  Silicone · CPC title

• B29C37/0032

  the coating being applied upon the mould surface before introducing the moulding compound, e.g. applying a gelcoat (B29C44/14 and B29C44/32 take precedence) · CPC title

• B29C37/0067

  Using separating agents during or after moulding; Applying separating agents on preforms or articles, e.g. to prevent sticking to each other (separating agents B29C33/60) · CPC title

• C08G77/06

  Preparatory processes · CPC title

• C08G77/46

  containing polyether sequences · CPC title