Two part silicone moldable eraser

Patent metadata

Field	Value
Publication number	US-11746235-B2
Application number	US-202016896347-A
Country	US
Kind code	B2
Filing date	Jun 9, 2020
Priority date	Jun 21, 2019
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

A moldable eraser kit includes a first silicone polymer, a second silicone polymer, an abrasive agent, a catalyst configured to catalyze a reaction between the first silicone polymer and the second silicone polymer at room temperature, and at least two containers such that the first silicone polymer, the second silicone polymer, and the catalyst are not all present in the same container. Also disclosed herein is a method of making an eraser including the steps of mixing a first silicone polymer, a second silicone polymer, a catalyst, an abrasive agent, and optionally one or more additives to form a mixture, the mixture being free of polyvinyl chloride. The method also includes molding the mixture to form a shape and curing the mixture in the shape at room temperature to form a molded eraser.

First claim

The invention claimed is:

1. A moldable eraser kit comprising:
a first silicone polymer;
a second silicone polymer, wherein the second silicone polymer comprises an alkenyl-functional organopolysiloxane;
an abrasive agent;
a catalyst configured to catalyze a reaction between the first silicone polymer and the second silicone polymer at room temperature; and
at least two containers such that the first silicone polymer, the second silicone polymer, and the catalyst are not all present in the same container,
wherein a moldable eraser made using the moldable eraser kit is free of polyvinyl chloride.

2. The moldable eraser kit of claim 1 wherein:
the at least two containers comprises a first container and a second container;
the first container comprises the first silicone polymer and, optionally, the abrasive agent; and
the second container comprises the second silicone polymer and, optionally, the abrasive agent.

3. The moldable eraser kit of claim 2 , wherein one or both of the first container and the second container further comprise the catalyst.

4. The moldable eraser kit of claim 2 , wherein the at least two containers further comprises a third container comprising the catalyst.

5. The moldable eraser kit of claim 2 wherein contents of each of the first container and the second container have a viscosity in the range of 0.5 cSt to 10,000,000 cSt.

6. The moldable eraser kit of claim 1 , wherein a first container of the at east two containers comprises the first silicone polymer, the second silicone polymer and, optionally, the abrasive; and wherein a second container of the at least two containers comprises the catalyst.

7. The moldable eraser kit of claim 1 further comprising one or more tools for molding, sculpting, stamping, and patterning.

8. The moldable eraser kit of claim 1 , wherein the first silicone polymer comprises poly(organosiloxane-co-hydroorganosiloxane).

9. The moldable eraser kit of claim 1 , wherein one or more of the at least two containers further comprise one or more additives, the one or more additives comprising at least one of a filler, a colorant including a dye and/or a pigment, glitter, a color developer, a preservative, and a fragrance.

10. The moldable eraser kit of claim 9 , wherein the colorant comprises at least one of a thermochromic colorant, a photoluminescent colorant, a pH-reactive colorant, a photochromic colorant, and a non-reactive colorant resistant to a chemical attack.

11. The moldable eraser kit of claim 10 , wherein the non-reactive colorant is resistant to a chemical attack from a reducing agent, bleach, or high pH conditions.

12. The moldable eraser kit of claim 9 , wherein the abrasive agent comprises at least one of pumice, calcium carbonate, clay, carborundum, emery, quartz powder, glass powder, alumina, zirconia, and silica (sand).

13. The moldable eraser kit of claim 9 , wherein the filler comprises at least one of a starch, flour, clay, mica, silica, alumina, hallow lightweight polymeric microspheres, solid microspheres, metallic powder, calcium carbonate, barium sulfate, titanium dioxide, zinc oxide, and ceramic material.

14. The moldable eraser kit of claim 13 , wherein the ceramic material comprises at least one of boron nitride, titanic, zirconia, alumina, silicon carbide, tungsten carbide, and silicon nitride.

15. The moldable eraser kit of claim 1 , wherein the catalyst is configured to catalyze a reaction between the first silicone polymer and the second silicone polymer at room temperature within 30 seconds to 60 minutes.

16. The moldable eraser kit of claim 1 , further comprising at least one of:
a first plurality of containers, each container of the first plurality of containers comprising the first silicone polymer and different from the other in at least one of color, viscosity, visual aesthetics, fragrance, or container size, and
a second plurality of containers, each container of the second plurality of containers comprising the second silicone polymer, and different from the other in at least one of color, viscosity, visual aesthetics, fragrance, or container size.

17. A method for making a molded eraser using the moldable eraser kit, of claim 1 , the method comprising the steps of:
mixing the first silicone polymer, the second silicone polymer, the catalyst, the abrasive agent, and optionally one or more additives to form a mixture, wherein the mixture is free of polyvinyl chloride, and wherein the one or more additives comprises at least one of a filler, a colorant including a dye, and/or a pigment, glitter, a color developer, a preservative, and a fragrance;
molding the mixture to form a shape; and
curing the mixture in the shape at room temperature to form a molded eraser.

18. The method according to claim 17 , further comprising, prior to the mixing step, the steps of:
providing a first container comprising the first silicone polymer and the abrasive,
providing a second container comprising the second silicone polymer and wherein one or both of the first container and the second container comprise the catalyst;
wherein the one or more additives are optionally present in at least one of the first container and the second container and
wherein the mixing step comprises nixing the contents of the first container and the second container.

19. The method according to claim 17 , wherein the first silicone polymer comprises poly(organosiloxane-co-hydroorganosiloxane).

20. The method according to claim 17 wherein the second silicone polymer comprises an alkenyl-functional organopolysiloxane, and the catalyst comprises a platinum catalyst.

21. An eraser made using the moldable eraser kit of claim 1 , the eraser having a composition comprising a silicone copolymer-based resin, the abrasive agent, and the catalyst,
wherein the silicone copolymer-based resin is a catalyst mediated cross-linking reaction product of the first silicone polymer and the second silicone polymer, and
wherein the eraser composition is free of polyvinyl chloride.

Assignees

• Crayola Llc

Inventors

• Moskal Michael G
• Anderson Caleigh
• Snyder Madison Paige
• Towne Jake

Classifications

• C08L83/04 Primary

  Polysiloxanes · CPC title

• B01J31/2286

  Alkynes, e.g. acetylides · CPC title

• B43L19/0025 Primary

  Eraser or rubber material, e.g. comprising hard particles · CPC title

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title

• C08K3/22

  of metals · CPC title